The perimeter of the entire figure is 62.8 cm.
Given, that the diameter of the inner semicircles is 9 cm and the width between the outer and inner semicircles is 2 cm.
The radius of the inner semicircle =4.5 cm and the radius of outer semicircle =5.5 cm (∵Diameter=9+2=11 cm)
We need to find the perimeter of the entire figure.
A perimeter is a closed path that encompasses, surrounds, or outlines either a two-dimensional shape or a one-dimensional length. The perimeter of a circle or an ellipse is called its circumference.
We know that, the circumference of a semicircle=πr and the circumference of two semicircles=2πr
Thus, the circumference of inner semicircles=2×3.14×4.5=28.26 cm
The circumference of outer semicircles=2×3.14×5.5=34.54 cm
The perimeter of the entire figure=28.26+34.54=62.8 cm
Therefore, the perimeter of the entire figure is 62.8 cm.
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The perimeter of whole path is 12.56 cm
Perimeter is the distance around the edge of a shape.
r1= 4.5cm, r2= 6.5cm
Perimeter of semicircle 1,
=πr1
= 3. 14 * 4.5
= 14.13 cm
Perimeter of semicircle 2
=πr2
= 3. 14 * 6.5
= 20.41 cm
Perimeter of path = 20.41 - 14.13 =6.28 cm
Perimeter of whole path = 2 * 6.28 =12.56
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