Diagonal to area

Calculate the area of a rectangle in which the length of the diagonal is 10 cm.

Correct result:

S =  36.6606 cm2

Solution:

u=10 cm a=4 cm b=u2−a2=102−42=2 21 cm≐9.1652 cm  S=a⋅ b=4⋅ 9.1652=8 21=36.6606 cm2

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