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Did u mean Total Surface Area?

Yes.

First Try to find the base of the right angled triangle

Is the formula SA =2B +(s1+s2+s3)h

Use pythagorean theorem

How would I do that?

|dw:1362320690928:dw| then,
9^2 +x^2 =15^2

caCan't you just use the fact that the 12m on the bottom is parallel to the leg on the top?

Oh yes! u can use it

I still don't get it.

Now, u can directly use the formula mentioned above

But I don't know what the base is.

It is 12

So, Find the Area of the Base

Okay. how do we do that?

Area of traingle =1/2 base * height

so 6 * 10.

No

Then what is the height?

Base of the triangle is 12 and height is 9

so 6 * 9 = 54

54 is our base now?

Yes, thats the Area of the right angled triangle base

So SA =2(54) +(s1+s2+s3)h

Now,
Total Surface Area = 2* Area of base +(s1+s2+s3) * height of the prism

The height of the prism is 10.

yes

SA =2(54) +(s1+s2+s3)10

How do we find the sides?

The sides are 9 , 12 and 15

Observe the figure

So, SA =2(54) +(9+12+15)10

very correct

The answer is 468

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Thank you. Do you think you can help me with two more?

welcome

31.4 is the circumference of the circle.

Hello?

Would I multiply that by 12?

the same as the *

Okay, thanks. Can you help me with one more?

sure

Oh is it 552.64^2?

You would find the circumference of the circle and you would multiply it by 11. the

The circumfrence is, 50.24

Multiplied by 11 is, 552.64

ya you go the right answer

Thank-you. You made it so much clearer. :)

no problem

I think that is all, should I close this?

well if i you have no more questions needed answered i suppose :P gl with your maths