tolong jawab no 1-6 (3-6) pake caranya

1. tali busur(B)

2.juring(D)

4.K=pi × D
=22/7×56
=176cm

6. Putaran=3,14×50 (karena berjari² 25cm)
=157cm
=15.700cm ÷ 157cm
=100 putaran