Question

Preciso da questão D

Answer 1

$A _{trapesio}= \frac{(B+b)h}{2} \\ \\ B=60cm \\ h=x=20 \sqrt{2}=20.1,41=28,2cm \\ \\ b= \sqrt{BD^{2}- (x^{2}) }= \sqrt{1600-800}= \sqrt{800}=28,2cm \\ \\ A _{trapesio}= \frac{(60+28,2)28,2}{2}= \frac{2492}{2}=1246cm$