queenkimm26
05.05.2020 •
Mathematics
What is the area of ACDE to the nearest whole number? 10 cm 20 cm 21 cm А A 87 cm B. 105 cm C. 123 cm D 210 cm
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Ответ:
118.4 cm²
Step-by-step explanation:
ΔABC:
a² + b² = c²
(10)² + b² = (20)²
b² = 300
b = √300 or 17.32
21 - 17.32 = 2.68 = CD
ACDE area:
AE = 21 cm
CD = 2.68 cm
DE = 10 cm
21 + 2.68 = 23.68
(23.68/2) * 10 = 118.4
Ответ:
I think the area is 72 sorry if it is wrong I tried
Step-by-step explanation: