Question

What is the area of ACDE to the nearest whole number? A. 87 cm2
B. 105 cm2
C. 123 cm2
D. 210 cm2

Answer 1

Answer:

C. 123 cm2

Step-by-step explanation:

The figure is presented below as attachment. The area of ACDE is:

$A = (10\,cm)\cdot (21\,cm) - \frac{1}{2}\cdot (\sqrt{(20\,cm)^{2}-(10\,cm)^{2}} )\cdot (10\,cm)$

$A \approx 123.397\,cm^{2}$

The answer is C.