Question

what will be the circumference of a circle after 20 minutes when there is a constant increase of 2 cm in its radius in every 5 minutes if initially the circle has a radius of 8cm

Answer 1

Answer:

there you go

Step-by-step explanation:

increase in radius in every 5 mins = 2cm

radius of the circle after 20 mins = 8+(20/5×2)

                                                       =8+8 = 16cm

circumference of the circle = 2πr

                                             =2×22/7×16

                                             =100.57cm (approx.)

Answer 2

Step-by-step explanation:

Increase of 2 cm in every 5 minute

so 20÷5=4min

It will increase in 20 min=4 × 2 = 8 cm

r=8cm

then c=50.27

50.27 × 8 = 402.16