Jawaban:

1. OP = r = 30 cm

PQ = d = 60 cm

• π = 3,14

• K = 188,4 cm

2. • OP = r = 21 cm

• PQ = d = 42 cm

• π = 22/7

• K = 132 cm

•K =π×d

3. OP = r = 8 cm

• PQ = d = 16 cm

• TT = 3,14

• K = 50,24 cm

4. • OP = r = 17,5 cm

PQ = d = 35 cm

• TT= 22/7

• K = 110 cm

5. • OP = r = 5 cm

• PQ = d = 10 cm

• TT = 3,14

• K =31,4 cm

6. OP = r = 42 cm

• PQ = d = 84 cm

• π = 22/7

• K = 264 cm

7. • OP = r = 28 cm

PQ = d = 56 cm

• TT= 22/7

• K = 176 cm

8. • OP = r = 15 cm

PQ = d = 30 cm

• TT = 3,14

• K = 94,2 cm

9. OP = r = 20 cm

• PQ = d = 40 cm

• π = 3,14

. K = 125,6 cm

10. OP = r = 24 cm

• PQ = d = 48 cm

• TT= 3,14

• K = 150,72 cm

Penjelasan dengan langkah-langkah:

1. OP = r = 30

• PQ = d = 2 x r = 2 x 30 = 60

• TT= 3,14

• K = πxd

= 3,14 x 60

= 188,4

2. • TT= 22/7

• K = 132

B/s

132 = 22/7d

d = 132 x 7 = 22

d=42=PQ

• r = OP = d÷2 = 42 ÷ 2

= 21

3. PQ = d = 16

• OP=r=d÷2

= 16 ÷2=8

• TT = 3,14

• K= πxd

= 3,14 x 16

= 50,24

4. . K = 110

• TT= 22/7

• K= πxd

110 = 22/7d

d = 110 x 7÷22 = 35 = PQ

• r = OP = d÷2=35÷2=17,5

5. PQ = d = 10

• OP=r=d ÷ 2

= 10 = 2 = 5

• TT = 3,14

• K= πx d

= 3,14 x 10

= 31,4

6. • T = 22/7

• K = 264

• K= πxd

264 = 22/7 d

d=264 x 7÷22

d = 84 = PQ

• OP=r=d÷2

= 84÷2=42

7. • OP = r = 28

• PQ = d = 2 xr

= 2 × 28

= 56

• TT= 22/7

• K= πxd

.

= 22/7 x 56

= 176

8. OP = r = 15

• PQ = d = 2 xr

= 2 x 15 = 30

• TT= 3,14

• K= πxd

= 3,14 x 30

= 94,2

9. PQ = d = 40

• OP=r=d÷2

= 40÷2= 20

• TT= 3,14

• K = πxd

= 3,14 x 40

= 125,6

10. OP = r = 24

• PQ = d = 2 xr

= 2 x 24 = 48

• TT= 3,14

• K= πxd

= 3,14 x 48

= 150,72

Rumus :

•r=d÷2

•d=2xr

• K = 2 × πxr atau π * d

Tips :

cara menentukan í bisa dilihat dari jari-jari (r) atau diameter (d). jika jari-jari(r) atau diameter (d) berkelipatan 7,maka í berjumlah 22/7, dan jika jari -jari (r) atau diameter (d) tidak berkelipatan 7, maka berjumlah 3,14.