Question

Determine a área do triângulo a seguir.
a 16 cm²
b 15 cm²
c 18 cm²
d 17 cm²
e 14 cm²

Answer 1

Resposta:

c) 18 cm ²

Explicação passo-a-passo:

Answer 2

Resposta:

$A=12cm^2$

Explicação passo-a-passo:

$A=\frac{bh}{2} \\\\h^2+3^2=5^2\\\\h^2=25-9\\\\h^2=16\\\\h^2=4^2\\\\h =4cm\\\\A=\frac{(9-3).4}{2}\\\\A=\frac{6.4}{2}\\\\A=\frac{24}{2} \\\\A=12cm^2$