Right triangular pyramid

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I am somehow confused with this problem. It is said that this is a right triangular pyramid, but it has an equilateral triangle base? I am confused. How can I find VA?

It doesn't look like it has any 90 degrees angle though?

All I can found is that from C to AB is $5\sqrt{3}$

Dont worry about the rest, I will do it myself

I just need some explanation where is the 90 degrees should be. Thank you

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1 Answer

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Wikipedia will clarify your problem:

A right pyramid has its apex directly above the centroid of its base. Nonright pyramids are called oblique pyramids. A regular pyramid has a regular polygon base and is usually implied to be a right pyramid

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