Rectangle 3-4-5

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

Correct answer:

S =  192 cm2

Step-by-step explanation:

u=20  32+42 = 52  (3x)2+(4x)2 = (5x)2  a=3/5 u=3/5 20=12 cm b=4/5 u=4/5 20=16 cm  S=a b=12 16=192=192 cm2   Verifying Solution:   d=a2+b2=122+162=20 cm d=u

Did you find an error or inaccuracy? Feel free to write us. Thank you!

Tips for related online calculators
Check out our ratio calculator.
See also our right triangle calculator.
Do you want to convert length units?
See also our trigonometric triangle calculator.

We encourage you to watch this tutorial video on this math problem: video1   video2

Related math problems and questions: