Determine 23

Determine in cm² the area of rectangle ABCD, whose longer side is a = 20 cm and whose diagonal is 10 cm longer than its shorter side.

Final Answer:

S =  300 cm2

Step-by-step explanation:

a=20 cm u = 10+b  u2=a2+b2  u2=a2+(u10)2 u2=202+(u10)2  20u=500  u=20500=25  u=25  b=u10=2510=15 cm  S=a b=20 15=300=300 cm2   Verifying Solution:   u2=a2+b2=202+152=25 cm



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