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anonymous
 one year ago
im kinda stuck can someone please help me?
Which solid figure has nine edges?
rectangular pyramid
octagonal pyramid
rectangular prism
triangular prism
anonymous
 one year ago
im kinda stuck can someone please help me? Which solid figure has nine edges? rectangular pyramid octagonal pyramid rectangular prism triangular prism

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mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.2dw:1437542778360:dw

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.2We can use Euler's formula F + V  E = 2 Rectangular pyramid: 5 faces, 5 vertices, 8 edges 5 + 5  8 = 2 Octagonal pyramid 9 + 9  16 = 2 dw:1437543052236:dw

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.2Rectangular prism 6 + 8  12 = 2 dw:1437543190313:dw

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.2Triangular prism 5 + 6  9 = 2

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.2dw:1437543338878:dw

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.2Here is a summary of what we have. We notice that all numbers work in Euler's formula, so that is a good indication the numbers of faces, vertices and edges are correct. Notice the only one that has a 9 in the E (number of edges) column F + V  E = 2 Rectangular pyramid 5 + 5  8 = 2 Octagonal pyramid 9 + 9  16 = 2 Rectangular prism 6 + 8  12 = 2 Triangular prism 5 + 6  9 = 2
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