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

1 Answer
Jan 7, 2018

Volume of the pyramid is 11 1/3 cubic.unit.

Explanation:

Volume of a pyramid is 1/3*base area *hight.

(x_1,y_1)=(2,5) ,(x_2,y_2)=(6,4),(x_3,y_3)=(7,8) , h=4

Area of Triangle is

A_t = |1/2(x1(y2−y3)+x2(y3−y1)+x3(y1−y2))|

A_b = |1/2(2(4−8)+6(8−5)+7(5−4))| or

A_t = |1/2(-8+18+7)| = 1/2|17| =17/2sq.unit.

Volume of pyramid is 1/3*A_b*h = 1/3 *17/2*4 = 34/3=11 1/3

cubic.unit [Ans]