the base of each piramid is a rectangle. Find the unknown dimension for each pyramid.
l=9cm
w=____
h=5cm
v=105cm cubed
i have three similar problems can you tell me how you found the answer thank you
2007-02-18 07:32:09 · 3 answers · asked by gingin 1 in Science & Mathematics ➔ Mathematics
Set up the equations that you use to find the volume of the figure, replace with what you know, and solve for your unknown.
The volume of a pyramid is (1/3) * (Area of the base)(height). Since the base is a rectangle, the area of the base is the length times the width.
So:
V = (1/3) * L * w * h
Replace with what you know:
105 = (1/3) * 9 * w * 5
Then solve for w:
105 = 15w
w = 7
2007-02-18 07:37:56 · answer #1 · answered by Anonymous · 1⤊ 0⤋
The volume of a rectangular pyramid is given by
v = lwh/3
So, w = 3v/lh = 3*105/(9*5) = 7cm
You should be able to work out the others from that formula.
2007-02-18 07:41:59 · answer #2 · answered by JJ 7 · 0⤊ 0⤋
V= (1/3) *L*W*H
105= (1/3) 9*W*5
105= 15 W
W=105/15
W=7 cm
best of luck
2007-02-18 07:48:48 · answer #3 · answered by k k 72 2 · 0⤊ 0⤋