Question

if the circumference of the circle is 132 cm.find yhe perimeter of the semi circle.(take pie=3.14)​

Answer 1

Answer:

perimeter of semi circle is 108.04cm.

Step-by-step explanation:

circumference of the circle = π ×diameter

diameter = circumference ÷ π

= 132÷3.14

= 42.04 CM

circumference of half circle = 132 ÷2

= 66 CM

perimeter of the semi circle is 42.04 + 66 = 108.04 CM

Answer 2

Answer: 108.02 cm

Step-by-step explanation:  

Formula: Circumference of the circle, $C = 2\pi r$

Given: Circumference of the circle, C = 132 cm and $\pi$ = 3.14

Using the given values in the formula,

$C = 2\pi r$

$\frac{C}{2\pi } = r$                                    ------- where 'r' is the radius of the circle

$r =\frac{132}{2 * 3.14} = \frac{132}{6.28} = 21.01 cm$

∴ Radius, r = 21.01 cm

Circumference of semi-circle = $\pi$r + 2r

                                                 = (3.14 × 21.01) + (2 × 21.01)

                                                 = 66 + 42.02

                                                = 108.02 cm

(OR)

Diameter, d = 2r

                    = 2 × 21.01

                 d = 42.02 cm

Perimeter of semi-circle = Half circumference of circle + diameter

                                         = 62 + 42.02

                                         = 108.02 cm