The base of a triangular pyramid is a triangle with corners at (6 ,2 ), (1 ,7 ), and (5 ,4 ). If the pyramid has a height of 8 , what is the pyramid's volume?

1 Answer

Volume V=20/3" "cubic units

Explanation:

Compute the area of the triangular base:

A=1/2[(x_1, x_2,x_3, x_1),(y_1, y_2, y_3,y_1)]

A=1/2(x_1y_2+x_2y_3+x_3y_1-x_2y_1+x_3y_2+x_1y_3)

Let
P_1(6,2)
P_2(5, 4)
P_3(1,7)

A=1/2[(6, 5,1, 6),(2, 4, 7,2)]

A=1/2[6*4+5*7+1*2-5*2-1*4-6*7]

A=1/2(24+35+2-10-4-42)

A=1/2(61-56)
A=5/2

Now compute the volume of the Pyramid

V=1/3*A*h=1/3*5/2*8

V=20/3" "cubic units

God bless....I hope the explanation is useful.