Answer:
120°
Step-by-step explanation:
x = angle supplement = 180-x
x = 4(180-x) -120
x = 720 - 4x - 120
5x = 600°
x =120°
Answer:
45
Step-by-step explanation:
Answer:
Try to look up formula charts online.
Step-by-step explanation:
Answer:
A = 136 cm²
Step-by-step explanation:
There are three pairs of rectangular faces
A = 2(ab) + 2(bc) + 2(ca)
A = 2(ab + bc + ca)
A = 2(3(4) + 4(8) + 8(3))
A = 136 cm²