Geometry Calculators

Collinear Points Calculator

Determine if three points are collinear using determinant and area method

Distance Between Two Points Calculator

Calculate straight-line distance between two coordinate points using the distance formula

Slope Calculator

Find slope from two coordinate points using rise over run with step-by-step work

Midpoint Calculator

Find the midpoint between two coordinate points by averaging x and y coordinates

Endpoint Calculator

Find a missing endpoint from one endpoint and midpoint using coordinate formulas

Point on Line Checker

Check whether a coordinate point satisfies a line equation Ax+By+C=0

Line Equation from Two Points Calculator

Find the equation of a line passing through two coordinate points

Section Ratio Calculator

Compute division point coordinates along a directed segment by given ratio

Point Symmetry Calculator

Find the reflected point of a point about line Ax+By+C=0

Angle Between Lines Calculator

Calculate the angle and tangent between two intersecting lines

Triangle Centers Calculator

Compute centroid, orthocenter, circumcenter, incenter and excenter of a triangle

Parallel Perpendicular Calculator

Determine if two lines are parallel, perpendicular, or intersecting

Parallel Line Through Point Calculator

Find a line parallel to Ax+By+C=0 through a given point

Perpendicular Line Through Point Calculator

Find a line perpendicular to Ax+By+C=0 through a given point

Perpendicular Bisector Calculator

Find the perpendicular bisector line equation given two endpoints

Angle Bisector Theorem Calculator

Apply the Angle Bisector Theorem to compute side ratios and bisector length

Centroid to Vertex Distance Calculator

Compute centroid coordinates and distances from centroid to each vertex

Circumradius & Inradius Calculator

Compute circumradius R and inradius r of any triangle from side lengths

Polygon Diagonal Calculator

Count total diagonals and diagonals per vertex for any n-sided polygon

Regular Polygon Area & Perimeter Calculator

Calculate area, perimeter, apothem, and circumradius of any regular polygon

Rectangle Area and Perimeter Calculator

Calculate rectangle area, perimeter, and diagonal from length and width

Square Area and Perimeter Calculator

Calculate square area, perimeter, and diagonal from side length

Trapezoid Area Calculator

Calculate trapezoid area from two bases and height

Parallelogram Area Calculator

Calculate parallelogram area and perimeter from base, height, and side length

Rhombus Area Calculator

Calculate rhombus area from two diagonals using d1*d2/2

Kite Area Calculator

Calculate kite area from two diagonals using d1*d2/2

Ellipse Area Calculator

Calculate ellipse area from semi-major and semi-minor axes using πab

Ellipse Circumference Calculator

Approximate ellipse circumference using Ramanujan formula

Interior Angle of Regular Polygon Calculator

Calculate each interior angle of a regular polygon from number of sides

Point Reflection Over Line Calculator

Find the reflective mirror point of a point across any line Ax+By+C=0

Midsegment Theorem Calculator

Apply the Triangle Midsegment Theorem to find midsegment lengths and medial triangle properties

Apothem Calculator

Compute the apothem, circumradius, area, and perimeter of any regular polygon

Chord Length Calculator

Calculate chord length, arc length, segment area, and sagitta from radius and central angle

Circle Circumference Calculator

Calculate circle circumference from radius using C=2πr with step-by-step work

Circle Area Calculator

Calculate circle area from radius using A=πr² with formula substitution

Annulus Area Calculator

Calculate ring area between two concentric circles using π(R²-r²)

Circle Segment Area Calculator

Calculate circular segment area from radius and central angle

Sector Perimeter Calculator

Calculate circular sector perimeter from radius and central angle

Diameter Calculator

Find circle diameter from radius using d=2r with clear geometry steps

Radius Calculator

Find circle radius from diameter using r=d/2 with simple steps

Circle Equation Calculator

Write the standard equation of a circle from center and radius

Circle Center and Radius Calculator

Find circle center and radius from general form x²+y²+Dx+Ey+F=0

Arc Length & Sector Area Calculator

Compute arc length, sector area, chord length, and sagitta of a circle sector

Tangent Line to Circle Calculator

Find the tangent line equation from an external point to a circle

Concave Polygon Area Calculator

Calculate the area of any simple concave or convex polygon using the Shoelace formula

Triangle Area Coordinate Calculator

Calculate triangle area from three coordinate points using the determinant formula

Triangle Perimeter Calculator

Calculate triangle perimeter from three side lengths and validate triangle inequality

Right Triangle Calculator

Find hypotenuse, area, and perimeter from two right-triangle legs

Pythagorean Theorem Calculator

Use a²+b²=c² to find the hypotenuse of a right triangle

3D Distance Calculator

Calculate distance between two points in three-dimensional coordinate space

Coordinate Perimeter Calculator

Calculate polygon perimeter from coordinate vertices using the distance formula

Heron's Formula Calculator

Compute triangle area, circumradius, inradius, and heights using Heron's formula from side lengths

Euler Line Calculator

Find the Euler line of a triangle and verify centroid, circumcenter, orthocenter collinearity

Law of Cosines Calculator

Find a missing triangle side from two sides and the included angle using the cosine rule

Triangle Angle Calculator

Find all three triangle angles from side lengths using the law of cosines

Similar Triangles Calculator

Find a missing corresponding side using proportional side lengths and scale factor

Equilateral Triangle Calculator

Calculate equilateral triangle area, height, perimeter, inradius, and circumradius

Cylinder Volume Calculator

Calculate cylinder volume and surface area from radius and height using πr²h

Sphere Volume Calculator

Calculate sphere volume, surface area, and diameter from radius using 4/3πr³

Cone Volume Calculator

Calculate cone volume, slant height, and surface area from radius and height

Rectangular Prism Volume Calculator

Calculate rectangular prism volume, surface area, and space diagonal

Triangular Prism Volume Calculator

Calculate triangular prism volume from triangle base, triangle height, and prism length

Pyramid Volume Calculator

Calculate pyramid volume from base area and vertical height using 1/3Bh

Semicircle Area Calculator

Calculate semicircle area and perimeter from radius using 1/2πr²

Hexagon Area Calculator

Calculate regular hexagon area, perimeter, and apothem from side length

Cube Volume Calculator

Calculate cube volume, surface area, and space diagonal from side length

Cube Surface Area Calculator

Calculate cube surface area, volume, and space diagonal from side length

Cylinder Surface Area Calculator

Calculate total and lateral surface area of a cylinder from radius and height

Cone Surface Area Calculator

Calculate total and lateral cone surface area from radius and slant height

Sphere Surface Area Calculator

Calculate sphere surface area, volume, and diameter from radius

Rectangular Prism Surface Area Calculator

Calculate box surface area, volume, and space diagonal from length, width, and height

Quarter Circle Area Calculator

Calculate quarter circle area and perimeter from radius using πr²/4

Pentagon Area Calculator

Calculate regular pentagon area, perimeter, and apothem from side length

Octagon Area Calculator

Calculate regular octagon area, perimeter, and apothem from side length

Frustum Volume Calculator

Calculate truncated cone volume from two radii and vertical height

Frustum Surface Area Calculator

Calculate truncated cone total and lateral surface area from radii and slant height

Capsule Area Calculator

Calculate capsule or stadium shape area and perimeter from radius and straight length

Capsule Perimeter Calculator

Calculate capsule or stadium shape perimeter and area from radius and straight length

Hemisphere Volume Calculator

Calculate hemisphere volume, curved area, and total surface area from radius

Hemisphere Surface Area Calculator

Calculate curved and total hemisphere surface area plus volume from radius

Ellipsoid Volume Calculator

Calculate ellipsoid volume from three semi-axis lengths using 4/3πabc

Torus Volume Calculator

Calculate torus volume and surface area from major radius and minor radius

Torus Surface Area Calculator

Calculate torus surface area and volume from major radius and minor radius

Heptagon Area Calculator

Calculate regular heptagon area, perimeter, and apothem from side length

Nonagon Area Calculator

Calculate regular nonagon area, perimeter, and apothem from side length

Decagon Area Calculator

Calculate regular decagon area, perimeter, and apothem from side length

Dodecagon Area Calculator

Calculate regular dodecagon area, perimeter, and apothem from side length

Triangular Prism Surface Area Calculator

Calculate triangular prism total surface area and volume from base sides and length

Pyramid Surface Area Calculator

Calculate square pyramid surface area, height, and volume from base side and slant height