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I have about 3 questions that need answer pretty quick. Please Help!

Mathematics
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1. Calculate the surface area of this triangular prism. a. 255 m^2 b. 360 m^2 c. 468 m^2 d. 495 m^2
1 Attachment
Did u mean Total Surface Area?
Yes.

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Other answers:

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
Basically to find the surface area you would need to find the area of each individual 2 dimensional shape and add them together.
2. What is the approximate length of the lateral surface for the cylinder shown here in net form? a. 31.4 in b. 62.8 in c. 78.5 in d. 376.8 in
1 Attachment
31.4 is the circumference of the circle.
Hello?
Would I multiply that by 12?
The circumference is 31.4 which is the same lateral surface of the rectangle so you already got your answer.
the same as the *
Okay, thanks. Can you help me with one more?
sure
Canned fruits, vegetables, and soups have labels on the curved surface of the metal container. What is the surface area of the label on this can? That is, what is the can's lateral area? a. 88 cm^2 b. 401.92 cm^2 c. 552.64 cm^2 d. 954.64 cm^2
1 Attachment
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

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