Geometry guides

Geometry studies properties of shapes. Most calculation problems use a formula for area, perimeter, volume, or a right-triangle relationship.

• How to Use the Pythagorean Theorem

  The Pythagorean theorem says that for a right triangle with legs a and b and hypotenuse c, a² + b² = c².

• How to Find the Area of a Circle

  The area of a circle is π times the square of the radius.