what are the formulas to finding the Volume and Area of these shapes: Triangle, Pyrimad, Cone, and Cylindar?

I need to get a better approach towards getting the answer to these types of questions:
~Find the height of a pyramid whose base is a regular nonagon with side length 8 inches and lateral faces are isosceles triangles with legs 30.
~ how do you get the answer to this question..step by step?

volume:
triangle-base x height divide by 2
pyramid-i don’t know but u cant blame me im only in 6th grade
cone -i dont know either but im the only one who answer the question so far because i luv math
cylinder-i know this lol………..ummm……yeah pie x radius squared x height

vote me best answer please !!!!!!!!!!!!!
LuBbBsz NaUtIi240 xoxoxox

One Response to “what are the formulas to finding the Volume and Area of these shapes: Triangle, Pyrimad, Cone, and Cylindar?”

  1. volume:
    triangle-base x height divide by 2
    pyramid-i don’t know but u cant blame me im only in 6th grade
    cone -i dont know either but im the only one who answer the question so far because i luv math
    cylinder-i know this lol………..ummm……yeah pie x radius squared x height

    vote me best answer please !!!!!!!!!!!!!
    LuBbBsz NaUtIi240 xoxoxox
    References :

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