Calculate the length of the boundary and the area of the shaded region in the following diagrams. All measurements are in centimeters.
Unshaded part is a semicircle.

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Solution

Area of shaded region
= area of rectangle - area of semicircle
$= l * b - \frac{1}{2} π r^{2}$
$= 7 * 10 - \frac{1}{2} \times \frac{22}{7} \times (\frac{7}{2})^{2}$
$= 70 - 19.25$
$= 50.75 c m^{2}$

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Calculate the length of the boundary and the area of the shaded region in the following diagrams. All measurements are in centimeters.Unshaded part is a semicircle.

Area of shaded region = area of rectangle - area of semicircle=l∗b−12πr2=7∗10−12×227×(72)2=70−19.25=50.75cm2

Calculate the length of the boundary and the area of the shaded region in the following diagrams. All measurements are in centimeters.
Unshaded part is a semicircle.

Area of shaded region
= area of rectangle - area of semicircle
$= l * b - \frac{1}{2} π r^{2}$
$= 7 * 10 - \frac{1}{2} \times \frac{22}{7} \times (\frac{7}{2})^{2}$
$= 70 - 19.25$
$= 50.75 c m^{2}$