Question

Item 18 A triangular sail has a base of 4 feet and a height of 10 feet. What is the area of a sail with double the base and double the height?

Answer 1

Answer:

$80{ft}^{2}$

$a \: = \frac{1}{2} b \times h \\ a = \frac{1}{2} \times 8 \times 20 \\ a= \frac{1}{2} \times 160 \\ a = 80$