It's not the 4th one:)
1 answer:
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Answer:
96 m²
Step-by-step explanation:
The unshaded region is a right triangle.
The area (A) of the triangle is calculated as
A = bh ( b is the base and h the perpendicular height )
Calculate b using Pythagoras' identity in the right triangle
b² + 16² = 20²
b² + 256 = 400 ( subtract 256 from both sides )
b² = 144 ( take the square root of both sides )
b = = 12
Thus area of unshaded region is
A = × 12 × 16 = 6 × 16 = 96 m²