Question

determine a área dos triângulos a seguir

Answer 1

a) $\frac{base x altura}{2}$
$\frac{7*4,5}{2}$
$\frac{31,5}{2}$ = 15,75

b) A = $\frac{5*12}{2}$
A = $\frac{60}{2}$
A = 30

c) A = $\frac{base * altura}{2}$
A = $\frac{6 * 4 }{2}$
A = $\frac{24}{2} = 12$

d) A = $\frac{2,8*4,5}{2}$
A= $\frac{12,6}{2}$
A = 6,3

Answer 2

a)7x4,5=31,5:2=  15,75cm²
b)13x5=65:2=  32,5cm²
c)6x4=24:2=  12cm²
d)4,5x2,8=12,6:2 = 6,3cm²