Question

Find the volume of the figure below.
60.75 miles^3
67.5 miles^3
65.7 miles^3
121.5 miles^3

Answer 1

Well this is basically a triangle multiplied by the height, so if oyu find the area of the traingle you just multiply that by the height

Answer 2

okay well how i would do it is find the area of the two right triangles created on the base, then add them together

then we can just multiply that area of the base by the height, which is 9

Answer 3

I don't know how to plug it in

Answer 4

there is nothing to plug "it" into

do you know how to find the area of a triangle?

Answer 5

yeah

Answer 6

A = 1/2 (4.5) (3)

Answer 7

1/2 (4) (3.5) and then you multiply it by 9 and @robz8 what that is dealing with is the surface area

Answer 8

You wouldn't add the area of the two sides and then multiply by 9 you're trying to find volume. Its just the area of the triangle times the height

Answer 9

it gave me 63

Answer 10

the volume of a prism is Base x Height

the base is 2 identical right triangles, so add them up, then multiply it by the height

@doulikepiecauseidont and no, that is not how you find the surface area

i said add the two right triangles on ONE base, not both of them

Answer 11

So the answer is 60.75 ?

Answer 12

@doulikepiecauseidont doing it your way, you wouldn't multiply it by 1/2 because there are 2 right triangles you are taking the area of

Answer 13

Oh, my bad, and @robz8 wouldn't it be easier to just find the area of the whole base at one time

Answer 14

you get 60.75 the same way

Answer 15

we know the base and we know the height

Answer 16

of the triangle

Answer 17

@glitterythings no, that is not the correct answer

@doulikepiecauseidont yes, that is why i said you add the two right triangles together

the answer is not 60.75

Answer 18

or is it 67.5?

Answer 19

I'm not understanding, either way if you do
(1/2)(4.5)(3)=6.75
or 2((1/2)(2.25 (this is the base of the right triangle))(3)=6.75????

Answer 20

OMG YES I GOT IT lol I just did it to

Answer 21

you don't take 1/2 of the area, there are TWO right triangles per BASE

Answer 22

itd be 121.5

Answer 23

yes sorry, 121.5

Answer 24

thank you guys (:

Answer 25

okay i'll just work it out because you two got yourself confused.... haha

you want to find the area of the base.

well you would normally do 1/2 (4) (3.5) but that would only be 1/2 the base

so your base area is 4 * 3.5 = 15

now multiply the base area by the height

13.5 * 9 = 121.5

121.5 is your area

Answer 26

yeah that's what I did and I got it (x

Answer 27

that was right?

Answer 28

oh not it was 60.75 :(

Answer 29

I'm not crazy! Lol

Answer 30

http://www.mathsteacher.com.au/year9/ch14_measurement/19_prism/prism.htm

Answer 31

And leave this question at it