Question

what is the area of a right triangle 5 centimeters high with a base of 9 centimeters?
a 45 cm
b 22.5 square cm
c 22.5 cm
d 14 square 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 $h=5$ cm, we substitute into the formula: $A=\frac{1}{2}\times9\times5$.

Step3: Calculate

$\frac{1}{2}\times9\times5=\frac{45}{2}=22.5$ square cm.

Answer:

B. 22.5 square cm