Question

Find the radii of the circle if circumference is:
(pi = 3.14)
(i) 100 m
(ii) 6.4 dm
​

Answer 1

Answer:

(i) 15.90 m

(ii) 1.01 dm

Step-by-step explanation:

i) 2πr = 100

2×22÷7×r =100

2×22×r=100×7

44×r=700

r=700÷44

r=15.90 m

ii) 2×22÷7×r=6.4

2×22×r=6.4×7

44×r= 44.8

r=44.8÷44

r=1.01

Answer 2

Answer:

i) r = 15.92 m (ii) r = 1.019 dm

Step-by-step explanation:

i) 2πr = 100 m

πr = 100/2 = 50

3.15 r = 50

so, r = 50/3.14

= 15.92 m (about )

ii) 2πr = 6.4 dm

πr = 6.4/2 = 3.2

3.15 r = 3.2

so, r = 3.2/3.14

= 1.019 dm (about )