# Rectangle

The rectangle is 21 cm long and 38 cm wide.

Determine the radius of the circle circumscribing rectangle.

Result

r =  22 cm

#### Solution:

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

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Showing 1 comment:
Pancake
Thanks, this really helped. Ima go eat my French toast now

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