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Question

If two triangular pyramids are sticked along a common base, then find the total number of edges in resultant solid figure.


A
12
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B
8
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C
9
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D
10
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Solution

The correct option is C 9

Triangular pyramid has 6 edges.

When two triangular pyramids are joined together along a common base, three edges are common.

So, the total number of edges in the resultant figure = 6 + 6 – 3 = 9

Hence, 9 is the correct answer.


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