Then r/a=h/a, and then r = h.
V cone = 1/3 pai * r 2 * h, V cylinder = pai * (a/2) 2h.
So there is1/3pai * h 2 * h = pai * a 2/4 * h.
That is, h 2 = 3a 2/4.
H= root number 3/2 a
Let's give an example to prove that many pairs of triangles are congruent.
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