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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

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 class=

Respuesta :

Answer:

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

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