Question

the vertical height of pyramid with volume 84cm and a base 9cm by 6cm is.

Answer 1

Answer:

Step-by-step explanation:

Use the formula for volume of cone

i.e. 1/3 πr^2h = 84

Radius of this cone (r) will be equal to diagonal of rectangle having length and breadth 9cm by 6 cm

(Diagonal)^2 = L*L + B*B

= 81+36

=√117

So r = √117÷2

1/3*22/7*√117/2*√117/2*h = 84

h = 84*3*7/22*4/117

h = 2.74 cm