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pentagon [3]
3 years ago
14

Help, Please, will give 20 points and brainiliest. URGENT!

Mathematics
1 answer:
777dan777 [17]3 years ago
7 0

Answer:

Step-by-step explanation:

b = 21 is the base, a is the height

area = 0.5ab = 210

ab = 420

a = 420/b = 420/21 = 20 ft

length of hypotenuse = √(a²+b²) = √(20²+21²) = √841 = 29 ft

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