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No. 3
L = phi x r²
154 = 22/7 x r²
r² = 154 : 22/7
r² = 154 x 22 : 7
r = √49
r = 7 cm
d = 2 x 7
d = 14 cm

No. 4
keliling = 2 x phi x r
44 = 2 x 22/7 x r
r = 44 : 44/7
r = 44 x 7 : 44
r = 7

No. 5
L = phi x r²
314 = 3,14 x r²
r² = 314 : 3,14
r = √100
r = 10

keliling = 2 x phi x r
= 2 x 3,14 x 10
= 62,8 cm

No. 6
keliling = 2 x phi x r
770 = 2 x 22/7 x r
r = 770 x 7/44
r = 122,5 cm
d = 2 x 122,5
d= 245 cm

No. 7
keliling = 2 x phi x r
= 2 x 3,14 x 40
= 251,2 cm

No. 8
keliling = 2 x phi x r
= 2 x 3,14 x 20
= 125,6 cm

= 125,6 x 30
= 3,768 cm = 37,68 m

No. 9
keliling = 2 x phi x r
66 = 2 x 22/7 x r
r = 66 x 7/44
r = 10,5 cm

Luas = phi x r²
L = 22/7 x 10,5 x 10,5
L = 346,5 cm²