Tlng cpt yh kk!!!!!!!!

panjang busur mn = a/360 × 2 × π × r
6π = 2π × (a/360 × r)
(a/360 × r) = 6π/2π = 3

L juring = a/360 × π × r × r
27π = a/360 × π × r × r
27π/π = a/360 × r × r
27 = (a/360 × r) × r
27 = 3 × r
r = 27/3 = 9