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Area Help - This is really annoying me!

Hey,

I'm doing revision and there's this question thats been ******* me off for ages!!

B) Find the area of the two sides

The answer is: (√3.2^2 + 1.15^2) x 4 = 13.6m^2.

All i would have done is multiplied 3.2 and 1.15. Please explain i've been staring at this question for ages :frown:

Thanks, Mike :smile:

Reply 1

generalebriety

It wants the area of the sides, not of the front and back.

Reply 2

steve2005

mike2niner4

Hey,

I'm doing revision and there's this question thats been ******* me off for ages!!

B) Find the area of the two sides

The answer is: (√3.2^2 + 1.15^2) x 4 = 13.6m^2.

All i would have done is multiplied 3.2 and 1.15. Please explain i've been staring at this question for ages :frown:

Thanks, Mike :smile:

You have to use Pythagoras to calculate the side

Reply 3

mike2niner4

Pythagorus is a^2 + b^2 = h^2 or something? To calculate the sides, which side is it we need to find because to me it just looks like a rectangle :P

Which two sides?

I've got the two triangles at each end its just the main middle bits.

Reply 6

Mist786

for the triangles just do 1/2 x b x h
but for the middle = 3.2 x 4 (cuz it is a rectangle)

Reply 7

jase951

Multiplying by 3.2 is wrong.

The sides are slanted and the height of the side rectangles are found by using Pythagoras theorem to find the length of the hypotenuse of the triangle (which equals the height of the rectangle). Which is what you answer you have provided is doing [(√3.2^2 + 1.15^2)].

(√3.2^2 + 1.15^2) x 4 = 13.6m^2.

And yes, A squared + B squared = C squared.