Rectangle 3-4-5

The sides of the rectangle are in a ratio of 3:4. The length of the rectangle diagonal is 20 cm. Calculate the content of the rectangle.

Correct result:

S =  192 cm2

Solution:

u=20 32+42=52 a=3/5⋅ u=3/5⋅ 20=12 b=4/5⋅ u=4/5⋅ 20=16 S=a⋅ b=12⋅ 16=192 cm2

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