ada yg tau ga jwban nya ? pake rumus please bantuin

dik : R = 24 cm
sudut = 210
dit : r=?

jawab

keliling kerucut
=210/360 x 2πR
=21/36 x 2π x 24
=28π cm

K=2πr
r=K÷2π
r=28π÷2π
r=14 cm