Tolongin dong nomor 29 sama 30 Makasih

29][
d = 14 cm
a. Luas lingkaran
= πr²
= 22/7 x 7 x 7
= 154 cm²
b. Keliling lingkaran
= πd
= 22/7 x 14
= 44 cm

30][
d = 21 cm
a. Luasnya
= 1/4πd²
= 1/4 x 22/7 x 21 x 21
= 346,5 cm²
b. Kelilingnya
= πd
= 22/7 x 21
= 66 cm