karinka10 karinka10

27-02-2018
Mathematics

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Please help me out with number 7 and please explain

Please help me out with number 7 and please explain class=

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tynollette tynollette

27-02-2018

there are two triangles (top and bottom) and 3 rectangles.
the area of the three rectangles is 10*12+10*9+10*7=280
Area of each triangle: 1/2 of 12*5=30
area of two triangles: 30+30=60
Total surface area: 280+60=340 m²

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