Question

what is the area of a right triangle 9 centimeters high with a base of 9 centimeters?
a 81 cm
b 18 square cm
c 40.5 square cm
d 40.5 cm

Explanation:

Step1: Recall area formula

The area formula for a triangle is $A=\frac{1}{2}bh$, where $b$ is the base and $h$ is the height.

Step2: Substitute values

Given $b = 9$ cm and $h=9$ cm, substitute into the formula: $A=\frac{1}{2}\times9\times9$.

Step3: Calculate result

$\frac{1}{2}\times9\times9=\frac{81}{2}=40.5$ square cm.

Answer:

C. 40.5 square cm