Question

please help me in this math Q​

Answer 1

Answer:

a) If Diameter = 9 cm then  circumference =28.26 cm

b) If diameter = 87 mm then circumference = 273.18 mm

c) If Radius = 18 cm then circumference =113.04 cm

d) If Radius = 39 1/2 m then circumference =248.06 m

Step-by-step explanation:

The circumference of the circle = 2π r = π  d (π - 3.14)

a) Diameter (d) = 9 cm

The circumference of the circle   = π  d

= 3.14  × 9 = 28.26 cm

b) diameter (d) = 87 mm

The circumference of the circle   = π  d

= 3.14  × 87 = 273. 18 mm

c) Radius = 18 cm

The circumference of the circle = 2π r

= 2 (3.14)(18)

= 113.04 cm

d) Radius = 39 1/2 m = 79/2 = 39.5

The circumference of the circle = 2π r

= 2 (3.14) (39.5)

= 248.06 m