## Thinking Mathematically (6th Edition)

$50$ square centimeters
RECALL: The area $A$ of a triangle can be found using the formula $A= \frac{1}{2}bh$ where b = base and h = height. The given polygon is a triangle with a base of 20 cm and a height of 5 cm. Use the formula above to obtain: $A = \frac{1}{2}20(5) = 50$ square centimeters