Side and diagonal

Find the circumference and the area of the rectangle if given: side a = 8 cm diagonal u = 10 cm.

Correct answer:

o =  28 cm
S =  48 cm2

Step-by-step explanation:

a=8 cm u=10 cm  a2+b2 = u2  b=u2a2=10282=6 cm  o=2 (a+b)=2 (8+6)=28 cm
S=a b=8 6=48 cm2

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