find the perimeter of a semicircular protractor of radius of 7cm
Answers
Answer:
Step-by-step explanation:
Perimeter of protactor= 1/2×2πr +2r
=πr+2r =22/7×7 +2(7) = 22+14= 36
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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