Question

preciso urgente plis​

Answer 1

Resposta:

$c ^{2} = a.m \\ 9 ^{2} = 13.m \\ 81 = 13.m \\ m = \frac{81}{13} \\ \\ a = m + n \\ 13 = \frac{81}{13} + n \\ n = 13 - \frac{81}{13} \\ n = \frac{169 - 81}{13} \\ n = \frac{88}{13} \\ \\ h ^{2} = m.n \\ h ^{2} = \frac{81}{13} \times \frac{88}{13} \\ h ^{2} = \frac{7128}{13} \\ h = \sqrt{ \frac{7128}{13} } \\ h = \sqrt{42.17} \\ h = 6.50 \: aproximadamente \\ \\ a = \frac{b \: \times \: h}{2} \\ a =( \frac{81 \div 13 \times 6.50}{2} ) \\ a = \frac{40.5}{2} \\ a = 20.25cm ^{2}$

acho que é isso