hitunglah luas lingkaran jika memiliki r/d seperti berikut

1. jika r = 14
L = 22/7 × 14 × 14
= 616

2. jika d = 31
L = 3,14 × 1/4 ×31 × 31
=754,385

3. jika r = 21
L = 22/7 × 21 × 21
= 1.386

4.jika d = 19
L = 3,14 × 19 × 19
= 1.133,54

5. jika r = 15
L = 3,14 × 15 × 15
= 706,5