Question

A área do triângulo

Answer 1

Resposta:

$A_{triangulo}=\frac{B*h}{2}$

$B=7cm$

$A_{triangulo}=\frac{7*h}{2}$

$h=?$

$sen(x)=\frac{C.o}{h}$

$sen(20)=\frac{h}{4}$

$h=1,368080573$$cm$

$A_{triangulo}=\frac{7*1,368080573}{2}$

$A_{triangulo}=4,788282007$$cm^2$

$A_{triangulo}$ ≈ $5cm^2$