Dijawab langsung ya plis yang benar ntar aku folow akun mu​

Penjelasan dengan langkah-langkah:

4. a. luas ○ = 3,14 × r ²

3,14 = 3,14 × r²

r² = 3,14 : 3,14

r² = 1

r = 1

keliling ○ = 2 × 3,14 × r

= 2 × 3,14 × 1

= 6,28

c. luas ○ = 22/7 × r²

616 = 22/7 × r²

r² = 616 ÷ 22/7

r² = 616 × 7/22

r² = 296

r² = 14

keliling ○ = 2 × 22/7 × r

= 2 × 22/7 × 14

= 88

5. a. keliling ○ = 22/7 × 2r

66 = 22/7 × 2r

66 = 22/7 × 2r

2r = 66 × 7/22

2r = 21

r = 10.5

luas ○ = 3.14 × r²

= 3.14 × 10.5²

= 3.14 × 110.25

= 346,185

b. keliling ○ = 22/7 ×2ŕ

88 = 22/7 ×2r

2r = 88 × 7/22

2r = 28

r = 14

luas ○ = 22/7 × r²

= 22/7 × 14 × 14

= 22 × 28

= 616

# semoga membantu #