Question

The perimeter of a semicircular protractor whose radius is. 7 cm is ​

Answer 1

Answer:

The perimeter of semicircular protractor with radius 7 cm is 22 cms

Step-by-step explanation:

Given radius of protractor = 7 cm

Perimeter of semicircle = $\pi r$

= $\frac{22}{7}$×7

= 22 cms

Answer 2

The perimeter of a semicircular protractor is 36 cm whose radius is 7 cm

Given:

• Semicircular Protractor with radius 7 cm

To Find:

• Perimeter

Solution:

Circumference of Circle = 2π(Radius)

Circumference of semi circle = π(Radius)

Diameter of Circle = 2 (Radius)

Step 1:

Perimeter of a semicircular protractor is circumference of semicircle + Diameter

Step 2:

Find circumference of semicircle using π = 22/7 and Radius 7 cm

= π (Radius)

= (22/7) * 7

= 22 cm

Step 3:

Find Diamter using Radius 7 cm

= 2 x7

= 14 cm

Step 4:

Calculate Perimeter of a semicircular protractor by adding circumference of semicircle and Diameter

22 + 14

= 36 cm

The perimeter of a semicircular protractor is 36 cm whose radius is 7 cm

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