A sailboat has a mast that holds a triangular sail. The sail has a base of twelve meters and a height of nine meters. The cost of the sail is $15 per square meter. What will it cost to make the sail?

First since it is a triangle and it says meter square that means its an area

so the area is 1/2hb h stands for height and b stands for base

so

a=1/2bh

a=1/2 (12) (9)

a=1/2 (108)

a=54m^2

It says the cost of sail is $15 per square meter

so

$15*54

=$810

Why times by 54 because if 1 piece is $15 how about 54pcs?

thats why we will multiply it