Painting a hut

It is necessary to paint the exterior walls of hut whose layout is a rectangle of 6.16 m x 8.78 m wall height is 2.85 meters. Cottage has five rectangular windows; three have dimensions of 1.15 m x 1.32 m and two 0,45 m x 0.96 m. How many m2 is necessary to paint?

Correct result:

S =  79.74 m2

Solution:

a=6.16 m b=8.78 m c=2.85 m  o=2 a+2 b=2 6.16+2 8.78=74725=29.88 m S1=o c=29.88 2.85=85.158 m2 S2=3 1.15 1.32=4.554 m2 S3=2 0.45 0.96=0.864 m2 S=S1S2S3=85.1584.5540.864=398750=398750 m2=79.74 m2



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