Question

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Answer 1

Answer:

1 radius 7cm Diameter 14 circumference 44

2 radius 14 diameter 28 circumference 88

3 radius 196 diameter 392 circumference 1232

4 radius 2.1 diameter 4.2 circumference 72.6

5 radius 3.5 diameter 7 circumference 22

6 radius 7cm diameter 14 circumference 44

Step-by-step explanation:

diameter = 2* radius

circumference = 2πr

π = 22/7

r = radius

Answer 2

(1) radius = 7cm

diameter = 2r

= 2×r= 7×214 cm

circumference=2πr or πd

= 7×2 × 22/7 = 44cm

(2) Diameter =28 cm

radius = d÷2

r= 28÷2

= 14 cm

circumference = πd = 22/7×28

=88cm

(3) circumference =1234cm

πd =1234

1234= 22/7 ×d

d= 1234×7 /22

= 392•63cm

r= 392•63÷2

=195•815cm

(4) circumference=72.6cm

πd=72.6×22/7

d= 228•1714cm

r=228•1714÷2

=114•086

(5) radius=3•5 cm

diameter = 3•5×2 = 7 cm

circumference =7×22/7

=22cm

(6) diameter=14cm

radius =14÷2= 7cm

circumference=22/7×14

=44 cm