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I need help on in the answer to his question

I need help on in the answer to his question-example-1

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24 edges

1) Examining that shape let's do it by parts since the pyramid is on top of that prism.

2) The edges of a Hexagonal pyramid have 12 edges but note that in this shape we have two combined figures, as well as a Hexagonal Prism, has 18 edges.

So we can write down the following:

Note that we mark in blue the ones already counted. So we can write out the following:

So that shape has 12 edges + (18 -6 (common edges) = 12 +12 = 24 edges

And that is the answer.

I need help on in the answer to his question-example-1
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