Question

art wants to cover an isosceles triangle with a height of 9 centimeters and a base of 7 centimeters in fabric. how much fabric does he need?
$a = \frac{1}{2} \times base \times height$
$a = \frac{1}{2} \times 7 \times 9$
$a = \frac{1}{2} \times 63 = 31.5$

Explanation:

Step1: Recall triangle area formula

The formula for the area of a triangle is \( A=\frac{1}{2}\times\text{base}\times\text{height} \).

Step2: Substitute values

Given base \( = 7 \) cm and height \( = 9 \) cm. Substitute into the formula: \( A=\frac{1}{2}\times7\times9 \).

Step3: Calculate the product

First, calculate \( 7\times9 = 63 \). Then, \( \frac{1}{2}\times63 = 31.5 \).

Answer:

31.5 square centimeters