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1. What is the total surface area of this prism?

2. The symmetrical decahedron shown has a two-inch-by-two-inch square as its top face and its bottom face. The isosceles trapezoids forming the other faces are all congruent. What is the total surface area of the solid?

10. In the diagram below, find AC.

 Jun 17, 2020
 #1
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1. The total surface area is 66.

 

2. The total surface area is 108.

 

3. By the sine law, AC = 4*sqrt(3).

 Jun 17, 2020
 #2
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Can you explain why it's 108?

 Jun 17, 2020

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