Rectangle

The rectangle is 21 cm long and 38 cm wide.

Determine the radius of the circle circumscribing rectangle.

Correct result:

r =  22 cm

Solution:

a=21 cm b=38 cm  u=a2+b2=212+3821885 cm43.4166 cm  D=u=43.41661885 cm43.4166 cm  r=D/2=43.4166/2=22 cma=21 \ \text{cm} \ \\ b=38 \ \text{cm} \ \\ \ \\ u=\sqrt{ a^2+b^2 }=\sqrt{ 21^2+38^2 } \doteq \sqrt{ 1885 } \ \text{cm} \doteq 43.4166 \ \text{cm} \ \\ \ \\ D=u=43.4166 \doteq \sqrt{ 1885 } \ \text{cm} \doteq 43.4166 \ \text{cm} \ \\ \ \\ r=D/2=43.4166/2=22 \ \text{cm}



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Pancake
Thanks, this really helped. Ima go eat my French toast now

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Pythagorean theorem is the base for the right triangle calculator.
See also our trigonometric triangle calculator.

 
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