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Perimeter of a Triangle

If a⃗=î+2ĵ ...

Question

If $\to a =^i + 2^j$ and $\to b = 3^j$ , then $\to a \cdot \to b =$

A

3

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B

-3

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C

6

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D

-6

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Solution

The correct option is C 6
Yes, a triangular pyramid has 4 triangular faces.

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