Answer:
A = 84 cm²
Step-by-step explanation:
The area (A) of a triangle is calculated as
A = [tex]\frac{1}{2}[/tex] bh ( b is the base and h the perpendicular height )
here b = 21 and h = 8 , then
A = [tex]\frac{1}{2}[/tex] × 21 × 8 = 10.5 × 8 = 84 cm²
