Figures

• Perimeter: length of the line around the outside of the figure (units = m, cm, in, ft).

• Circumference: same a perimeter, but for a circle

• Area: the interior space of shape in 2 dimensions (units = m², cm², in², ft²)

• Volume: the interior space of shape in 3 dimensions (units = m³, cm³, in³, ft³)

Circles

• Circumference = 2 π r (r = radius)

• Area = π r² (r = radius)

• r = 1/2 * d (r = radius, d = diameter)