9514 1404 393
Answer:
(C) 64.26 m²
Step-by-step explanation:
You know the area is almost, but not quite, the area of two squares that are 6 m on a side. The area of one of those squares is (6 m)² = 36 m². The area of two of them is 2×36 m² = 72 m².
Since the area is larger than 36 m² and smaller than 72 m², there is only one answer choice that makes any sense:
64.26 m²
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<em>Additional comment</em>
That value is obtained using 3.14 for pi.
ABD = ABC + DBC
Eqivalent to:
78 = (5x + 3) + (5x - 5)
78 = 5x + 5x + 3 - 5
78 = 10x - 2
80 = 10x (move -2 to the left side and get 78 + 2 = 80)
8 = x (80/10 = 8)
With x = 8,
ABC = 5x - 5 = 8*5 - 5 = 40 - 5 = 35
DBC = 5x +3 = 8*5 + 3 = 40 + 3 = 43
