Twelve increased by a number
1 answer:
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first polygon
ext. angle=180°-120°
=60°
n=360°/60°
n=6
second polygon
n=2(6)=12
ext. ang= 360°/n = 360°/12° = 30°
int. ang = 180°-30°= 150°
answer is C
Answer:
486
Step-by-step explanation:
Hello!
To find the surface area of a cube we use the equation
S is the surface area
a is the side length
Put what we know into the equation
Solve
S = 6 * 81
S = 486
Hope this Helps!