Question

The diameter of a semicicular protractor is 7 cm.find its area

Answer 1

Answer:

110.25

Step-by-step explanation:

To get radius= diameter/2

radius= 7/2= 3.5

Area = 1/2 * pi * radius^2

we need to find the perimeter before finding the area; the formula is

1/2*(2πr) + 2r or can use r(2+22/7)

1/2*22/7*3.5+2*3.5= 18

1/2*18*3.5²

​=110.25