Tolong doong semuanya kecuali nmr 5,7 sm 9

3. a. K = 22/7 x 2 x 28 = 1.232/7 = 176 cm

b. K = 22/7 x 2 x 7 = 308/7 = 44 cm

c. K = 3,14 x 2 x 6,5 = 40,82 cm

d. K = 3,14 x 2 x 18,84 = 118,3152 cm

4. selisih jari² = 4/2π = 2/π cm

6. perbandingan keliling = √25 : √36 = 5 : 6

8.
a. Luas = 22/7 x (56/2)² = 2.464 cm²

b. Luas = 3,14 x (200/2)² = 31.400 cm²

c. Luas = 3,14 x (2,4/2)² = 4,5216 m²

d. Luas = 22/7 x (63/2)² = 3.118,5 dm²

10. Luas daerah diantara kedua lingkaran

= 3,14 x (10² – 8²)

= 3,14 x (100-64)

= 3,14 x 36

= 113,04 cm²