Geometry & Coordinate Geometry calculators
Shapes, sides and points on a grid. Find areas of common shapes with the correct square units, missing sides with the Pythagorean theorem, and the slope, equation and distance between two points. Answers are exact where possible, with surds and π kept until the final decimal, and every result is checked with an independent formula.
Pythagorean Theorem Calculator
Find the hypotenuse or a missing side of a right triangle using a² + b² = c².
Area Calculator
Find the area of a rectangle, square, triangle, circle, trapezoid or parallelogram.
Slope Calculator
Find the slope (gradient) of a line through two points, plus its equation y = mx + c, angle and perpendicular slope.
Distance Between Two Points Calculator
Find the distance between two points on a graph using the distance formula.
Midpoint Calculator
Find the midpoint between two points by averaging the coordinates.
Triangle Calculator
Solve any triangle from three known parts: sides, angles, area, perimeter and type, using the laws of sines and cosines.
Circle Calculator
Enter the radius, diameter, circumference or area of a circle and get the other three, with exact answers in terms of π and a diagram.
Volume Calculator
Find the volume of a cube, cuboid, cylinder, cone, sphere, hemisphere or square pyramid.
Surface Area Calculator
Find the total surface area of a cube, cuboid, cylinder, cone, sphere, hemisphere or square pyramid, broken down face by face with a chart.
Perimeter Calculator
Find the perimeter of a rectangle, square, triangle, regular polygon, semicircle or the circumference of a circle, with exact answers in π.
Arc Length & Sector Area Calculator
Find the arc length, sector area and chord length from a radius and an angle in degrees or radians, with exact answers in π.
Regular Polygon Calculator
Find the interior and exterior angles, area, perimeter, apothem and diagonals of any regular polygon from the number of sides and side length.
Equation of a Circle Calculator
Write the equation of a circle from its centre and radius, or find the centre and radius from the general form by completing the square.
Point-Slope Form Calculator
Find the equation of a line from one point and its slope, in point-slope, slope-intercept and standard form, with a graph.
Parallel & Perpendicular Line Calculator
Find the equations of the lines parallel and perpendicular to y = mx + c through a given point, using equal and negative reciprocal slopes.