1 answer:
Answer:
F. cylinder
Step-by-step explanation:
A cylinder has a circle for its base, which has no vertices and is not a polygon. This, therefore, disqualifies a cylinder as a polyhedron.
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Answer:
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Step-by-step Explanation

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x=2nd side
2x=1st side
3x-20=3rd side
x+(2x)+(3x-20)=106
6x-20=106
6x-20+20=106+20
6x=126
6x/6=126/6
x=21
1st side=42 ft
2nd side-21 ft
3rd side=43 ft