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Irina-Kira [14]
3 years ago
14

Check my answer please

Mathematics
1 answer:
Aleksandr [31]3 years ago
5 0
So it is an isosceles triangle that means that the bottom two angles are equal...
so 
40 = 5x 
divide both sides by 5 and you get 8

now the triangle angles add up to 180
we make an equation out of it...
(2y + 20 ) + ( 5(8)) + 40 = 180
2y + 20 + 40 + 40 = 180
combine like terms
2y + 100 = 180
so subtract 100 from both sides
2y = 80
divide by 2 to isolate the variable
y = 40

You are correct!!! :)
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AlekseyPX

Answer:

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Step-by-step explanation:

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Total surface  =  surface area of the base square + area of 4 triangles

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surface area of the square =  s^2

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