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I don't get how to do this, when I solved for it I got 125...

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I don't get how to do this, when I solved for it I got 125...

anonymous · Answer

attachment

anonymous · Answer

@study100

mathmate · Answer

Total surface = Lateral surface (AL) and Area of base (AB)

AB= area of square base
AL=4*area of each triangular slant face, each of which has a base of 10, and a height S calculated using Pythagoras Theorem:
|dw:1406939046962:dw|
where
S=sqrt(5^2+12^2)

Add up all the areas to get the total surface area, AT.
AT should match one of the choices provided.

anonymous · Answer

S equals 13.

anonymous · Answer

so What I would do would be, 
4*10+13...

anonymous · Answer

5 times.

anonymous · Answer

no I would do,.. 1/2  (12)(10)

which equals 60.. and there are 5 faces....so im doing something wrong..

anonymous · Answer

@study100

anonymous · Answer

ok s= 13

and s is your surface height

so 1/2(13)(10)

mathmate · Answer

Yes, (1/2)(13)(10) for one slant face.