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Which of the following shapes has 9 edges and no apex?

A. Right triangular prism
B. Right rectangular prism
C. Right circular cylinder
D. Right pyramid

Answer :

To solve the problem, we need to identify the shape with 9 edges and no apex.

Step 1: Analyze the right triangular prism.
- A right triangular prism has two triangular bases.
- Each triangle has 3 edges, so the two bases provide a total of [tex]$3+3=6$[/tex] edges.

Step 2: Count the lateral edges.
- There are 3 lateral edges that connect corresponding vertices of the two triangular bases.

Step 3: Add the edges together.
[tex]$$\text{Total edges} = 6 \text{ (base edges)} + 3 \text{ (lateral edges)} = 9.$$[/tex]

Step 4: Confirm the absence of an apex.
- An apex is a single pointed vertex, which is found in pyramids.
- A right triangular prism does not have any apex.

Thus, the shape with 9 edges and no apex is the right triangular prism.

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Rewritten by : Barada