Answer:
A = 84 cm²
Explanation:
The area (A) of a triangle is calculated as
A = bh ( b is the base and h the perpendicular height )
here b = 21 and h = 8 , then
A = × 21 × 8 = 10.5 × 8 = 84 cm²
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bh ( b is the base and h the perpendicular height ) × 21 × 8 = 10.5 × 8 = 84 cm²