kak gimana caranya soal no 2 a dan b

A.
1 kuadran = 1/4 lingkaran

1/4.Keliling lingkaran + 2r
= 1/4.22/7.2.14 + 2(14)
= 22 + 28 = 50

B.
2/3.3,14.2.6 + 2(6)
25,12 + 12
= 37,12