Diamonds puzzle

The puzzle is composed of paper diamonds. One diamond has a tent 3.4 cm long and a corresponding height of 2.5 cm. How much paper in dm squared is needed for 60 diamonds?

Correct answer:

S =  5.1 dm2

Step-by-step explanation:

a=3.4 cm h=2.5 cm n=60  S1=a h=3.4 2.5=217=8.5 cm2 S2=S1 dm2=S1:100  dm2=8.5:100  dm2=0.085 dm2  S=n S2=60 0.085=5.1 dm2

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