Q9 of 157 Page 819

Find the perimeter of a semicircular protractor whose diameter is 14 cm.

Given:

Diameter of the semicircular protractor = 14 cm


Radius of the protractor = cm = 7 cm


∵ Perimeter of semicircle = πr + d


∴ Perimeter of semicircular protractor = × 7 + 14 = 22 + 14


= 36 cm


Hence, the perimeter of the semicircular protractor is 36 cm.


More from this chapter

All 157 →
7

Find the diameter of the circle whose area is equal to the sum of the areas of two circles having radii 4 cm and 3 cm.

 8

Find the area of a circle whose circumference is 8π.

 10

Find the radius of a circle whose perimeter and area are numerically equal.

 11

The radii of two circles are 19 cm and 9 cm. Find the radius of the circle which has circumference equal to the sum of the circumferences of the two circles.