Bantuin jawab, deadline ​

1.a.7 cm

K=2×π×r

=2×22/7×7

=2×22×1

=44 cm

.b.20 cm

K=π×d

=3,14×20

=62,8 cm

c.K=2×π×r

=2×22/7×21

=2×22×3

=44×3

=132 cm

2.a.K=44 cm

D=14 cm

R=7 cm

b.K=132 cm

D=42 cm

R=21 cm

c.K=125,6 cm(π=3,14)

D=40 cm

R=20 cm

d.K=110 cm

D=35 cm

R=17,5 cm

e.K=314 cm(π=3,14)

D=100 cm

R=50 cm

f.K=880 cm

D=280 cm

R=140 cm

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