Question

a) 310 cm²
b) 320 cm²
c) 330 cm²
d) 348 cm²​

Answer 1

Resposta:

esse poliedro tem 8 faces triangulares equilaterais

base b = BC = 10

altura

10² = a² + (10/2)²

a² = 100 - 100/4 = 75

a = 5√3 cm

b = 10 cm

A = ba/2 = 10*5√3/2 = 25√3

8 faces

B = 8A = 200√3 cm²

B = 346.4 cm²

alternativa d) 348 cm²