Question

If an average rectangular block of limestone used to build the Great Pyramid of Khufu at Giza is approximately 2.5 feet by 3 feet by 4 feet and limestone weighs approximately 170 pounds per cubic foot, what is the weight of one of the nearly 2,300,000 limestone blocks used to build the pyramid?

Answer 1

First find the volume of the block, then multiply by 170
volume = length *width*depth

Answer 2

can u show me that volume = length *width*depth?

Answer 3

can u show me that volume = length *width*depth?

Answer 4

why that is the volume?
well imagine how many 1 cubic foot boxes could fit in our 2.5 by 4by3 block
the base of our figure is a rectangle of length 4 and width 3
thats an area of 12 so i could draw 12 1 ft squares, now imagine each of these squares is 1 ft high, to fill up the block we would need 2.5 layers of these 12 cubes
does that help at all?

Answer 5

then what happen next

Answer 6

well the volume is the total number cubes
12*2.5

Answer 7

i got 30

Answer 8

correct

Answer 9

now since each cubic foot weighs 170 lbs
->30 * 170

Answer 10

is that a neg?

Answer 11

no sorry its an arrow

Answer 12

my bad

Answer 13

51oo

Answer 14

correct
for the other problem you posted, its done the same way except you have to find the area of the triangle first

Answer 15

which is

Answer 16

Area of triangle = (1/2)*length*height

Answer 17

which is the lenght and height

Answer 18

look at the triangle part of the diagram
these 2 lines represent length and height

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Answer 19

I mean the number of the triangle

Answer 20

its on the diagram

Answer 21

1/2 (3)x2.5?

Answer 22

no that was for the last problem,
i thought we were talking about the triangular prism (the ramp)?

Answer 23

oop my bad