Question

Plz Solve These 2 Questions Fast

The diameter of a compact disc (CD) is 12 cm. Find the circumference of
the CD disc in terms of π.

The diameter of a circular-shaped rangoli is 50.40 cm. Find the area of the
rangoli.

Answer 1

The circumference of CD is :-
d=12cm
Circumference of circle= πd=12d

For Rangoli :-
d=50.40cm
therefore ,r=50.40÷2=25.20cm
area of rangoli=πr×r=(22÷7)×25.20×25.20=19958.4 sq. cm

Answer 2

1 ans

let circumference be x

circumference = 2 pi diameter

x = 2×3.14×12

x = 6.28×12

x = 75.36

the circumference of a CD is 75. 36

2 ans

if diameter of a circle is 15.40

then the radius of the circle is 15.40 / 2

Radius = 7.20

the area of a circle is Pi R Square

A = 22/7×7.20 square

A = 162.86