Hitunglah daerah yang diarsir

a. K = ½ Keliling Ling + 36 + ½ keliling Ling
= ½ πd + 36 + ½πd
= πd + 36
= 22/7 . 14 + 36
= 44 + 36
= 80 cm
b. K = ¼ K Ling + ¼ K Ling + ½ K Ling +19+19
= K Ling + 38
= 3,14 . 12 + 38
= 37,68 + 38
= 75,68 cm