Geometry

How to Find Missing Rectangle Sides From Area or Diagonal

Find missing rectangle sides from area, perimeter or diagonal. Work through supported measurement pairs, impossible inputs and checks for a valid answer.

6 min read · Practical examplesGeometry

Area of Shapes: How to Choose the Right Formula

Choose area formulas for eight common shapes. Check perpendicular heights, circle radii, ellipse semiaxes and rhombus diagonals with worked examples.

6 min read · Practical examplesGeometry

Volume of Shapes: Formulas, Dimensions and Worked Examples

Calculate volumes of seven common solids with checked examples. Identify radii, perpendicular heights and prism lengths, and keep cubic units consistent.

6 min read · Practical examples