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In the below figure, $ O E=20 \mathrm{~cm} $. In sector OSFT, square OEFG is inscribed. Find the area of the shaded region."
Given:
\( O E=20 \mathrm{~cm} \).
In sector OSFT, square OEFG is inscribed.
To do:
We have to find the area of the shaded region.
Solution:
Length of the side of the square $s= 20\ cm$
This implies,
Diagonal of the square $=\sqrt{2} \times s$
$=\sqrt{2} \times 20$
$=20 \sqrt{2} \mathrm{~cm}$
Radius of the sector $r=20 \sqrt{2} \mathrm{~cm}$
Therefore,
Area of the quadrant $OTFS =\frac{1}{4} \times \pi r^{2}$
$=\frac{1}{4}(3.14) \times(20 \sqrt{2})^{2}$
$=\frac{1}{4} \times 3.14 \times 800$
$=628 \mathrm{~cm}^{2}$
Area of the square $OEFG=s^2$
$=(20)^{2}$
$=400 \mathrm{~cm}^{2}$
Area of the shaded region $=$ Area of the quadrant $-$ Area of the square
$=628-400$
$=228 \mathrm{~cm}^{2}$
The area of the shaded region is $228\ cm^2$.