# Rectangle

The rectangle is 21 cm long and 38 cm wide.

Determine the radius of the circle circumscribing rectangle.

Result

r =  22 cm

#### Solution:

$a = 21 \ cm \ \\ b = 38 \ cm \ \\ \ \\ u = \sqrt{ a^2+b^2 } = \sqrt{ 21^2+38^2 } = \sqrt{ 1885 } \ cm \doteq 43.4166 \ cm \ \\ \ \\ D = u = 43.4166 = \sqrt{ 1885 } \ cm \doteq 43.4166 \ cm \ \\ \ \\ r = D/2 = 43.4166/2 \doteq 21.7083 = 22 \ \text { cm }$

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

#### Following knowledge from mathematics are needed to solve this word math problem:

Do you want to convert length units? Pythagorean theorem is the base for the right triangle calculator. See also our trigonometric triangle calculator.

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