tolong saya pake cara

5) K. Lingkaran = 2 × pi × r
=2 × 22/7 × 21 = 132 cm persegi (A)

6) L. Lingakaran = pi × r kuadrat
616 cm kuadrat = 22/7 × r kuadrat
616 × 7 = 22 × r kuadrat
4.312 = 22r kuadrat
4.312/22 = r kuadrat
196 = r kuadrat
√196 = r
14 = r

K. Lingkaran = 2 × pi × r
= 2 × 22/7 × 14
= 88 cm (C)

7) -

8) Panjang lintasan = keliling roda × banyak roda berputar
x = 2 × 22/7 × r × 2000
x = 2 × 22/7 × 35 cm × 2000
x = 220 × 2000
x = 440.000 cm/100.000
x = 4,4 (B)

5.) A. 132
6.) C.88
7.) A.119
8.) B.4,4