Answer:
The triangle's base is 9 inches.
Step-by-step explanation:
The area of a triangle is calculated with the base × perpendicular height × [tex]\frac{1}{2}[/tex].
We already know the area is 18 square inches and the perpendicular height is 4 inches, so we can calculate the base.
4 × b × [tex]\frac{1}{2}[/tex] = 18
2 × b = 18
b = 18 ÷ 2
b = 9
