Jawaban:

gak pake cara:

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

3. • OP = r = 8 cm

• PQ = d = 16 cm

• π = 3,14

• K = 50,24 cm

4. • OP = r = 17,5 cm

• PQ = d = 35 cm

• π = 22/7

• K = 110 cm

5. • OP = r = 5 cm

• PQ = d = 10 cm

• π = 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

• π = 22/7

• K = 176 cm

8. • OP = r = 15 cm

• PQ = d = 30 cm

• π = 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

• π = 3,14

• K = 150,72 cm

Penjelasan dengan langkah-langkah:

pake cara:

1. • OP = r = 30

• PQ = d = 2 × r = 2 × 30 = 60

• π = 3,14

• K = π × d

= 3,14 × 60

= 188,4

2. • π = 22/7

• K = 132

• K = π × d

132 = 22/7d

d = 132 × 7 ÷ 22

d = 42 = PQ

• r = OP = d ÷ 2

= 42 ÷ 2

= 21

3. • PQ = d = 16

• OP = r = d ÷ 2

= 16 ÷ 2 = 8

• π = 3,14

• K = π × d

= 3,14 × 16

= 50,24

4. • K = 110

• π = 22/7

• K = π × d

110 = 22/7d

d = 110 × 7 ÷ 22 = 35 = PQ

• r = OP = d ÷ 2 = 35 ÷ 2 = 17,5

5. •PQ = d = 10

• OP = r = d ÷ 2

= 10 ÷ 2 = 5

• π = 3,14

• K = π × d

= 3,14 × 10

= 31,4

6. • π = 22/7

• K = 264

• K = π × d

264 = 22/7 d

d = 264 × 7 ÷ 22

d = 84 = PQ

• OP = r = d ÷ 2

= 84 ÷ 2 = 42

7. • OP = r = 28

• PQ = d = 2 × r

= 2 × 28

= 56

• π = 22/7

• K = π × d

= 22/7 × 56

= 176

8. • OP = r = 15

• PQ = d = 2 × r

= 2 × 15 = 30

• π = 3,14

• K = π × d

= 3,14 × 30

= 94,2

9. • PQ = d = 40

• OP = r = d ÷ 2

= 40 ÷ 2 = 20

• π = 3,14

• K = π × d

= 3,14 × 40

= 125,6

10. • OP = r = 24

• PQ = d = 2 × r

= 2 × 24 = 48

• π = 3,14

• K = π × d

= 3,14 × 48

= 150,72

rumus nya:

• r = d ÷ 2

• r = d ÷ 2• d = 2 × r

• r = d ÷ 2• d = 2 × r• K = 2 × π × r atau π × d