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Mathematics 9 Online
OpenStudy (anonymous):

In the figure, the dashed line divides the arrow in half. What is the total area of the arrow?

OpenStudy (anonymous):

OpenStudy (anonymous):

60 square centimeters 68 square centimeters 80 square centimeters 82 square centimeters

OpenStudy (anonymous):

Please help!

OpenStudy (anonymous):

Divide the arrow into a rectangle and a triangle

OpenStudy (anonymous):

I did, and I did 0.5x8x5 and got 20. Then the area of the other side and it is 68. 68+20= 88 and is not right.

OpenStudy (anonymous):

It should be 3 not 5

OpenStudy (anonymous):

the area of a triangle is the base x height/2

OpenStudy (anonymous):

The base is 8 and the height is 3

OpenStudy (anonymous):

Okay I see that, so it would be 48.... but then I must have did the wrong area for the rectangle too?? because it still doesn't give me the answer when added up.

OpenStudy (anonymous):

how did you get 48?

OpenStudy (anonymous):

(8 x 3)/2

OpenStudy (anonymous):

Oh I thought you meant multiply!

OpenStudy (anonymous):

So 12

OpenStudy (anonymous):

yep

OpenStudy (anonymous):

68 is also right

OpenStudy (anonymous):

68+12= 80 so that's the answer ?

OpenStudy (anonymous):

yes

OpenStudy (anonymous):

Awesome thank you for helping me figure out what I did wrong! 5 stars :)

OpenStudy (anonymous):

haha no problem

OpenStudy (anonymous):

Do you mind showing me one more? It's okay if you don't want to

OpenStudy (anonymous):

:)

OpenStudy (anonymous):

sure

OpenStudy (anonymous):

An envelope is pulled apart to create this figure. What is the total surface area of one side of the envelope?

OpenStudy (anonymous):

OpenStudy (anonymous):

25 square centimeters 37 square centimeters 50 square centimeters 64 square centimeters

OpenStudy (anonymous):

Not sure what to do.

OpenStudy (anonymous):

ok, we have two triangles and one rectangle

OpenStudy (anonymous):

Alright

OpenStudy (anonymous):

What are the dimensions of the two triangles?

OpenStudy (anonymous):

what are the dimensions of the triangle at the top of the rectangle?

OpenStudy (anonymous):

3x6 2x4

OpenStudy (anonymous):

that's right, so find the area of those triangles

OpenStudy (anonymous):

9 and 4 ?

OpenStudy (anonymous):

yep, there are to of both types

OpenStudy (anonymous):

what is the area of the rectangle?

OpenStudy (anonymous):

24

OpenStudy (anonymous):

ok, so what's the final area?

OpenStudy (anonymous):

50?

OpenStudy (anonymous):

good job

OpenStudy (anonymous):

But since it says one side of the envelope wouldn't that make it 25?

OpenStudy (anonymous):

that is one side of the envelope. If it asked for both sides the answer would be 100

OpenStudy (anonymous):

Oh! okay, thank you so much once again! You are awesome!

OpenStudy (anonymous):

no problem

OpenStudy (anonymous):

Thanks for the testimonial!

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