Gimana cara nyari luasnya #mohondijawab

1 a. cari diameter lingkaran dg pitagoras
→ x² = 20²- 16²
→ x = √400- 256
→ x = √144
→ x = 12

luas ½lingkaran = ½.¼πd²
= ½.¼.3,14.12.12
= 3,14 × 18
= 56.52 cm²

b. DC = √20²-12²
= √400-144
= √256
= 16

AB = √20²+15²
= √400+225
= √625
= 25

luas trapesium
=(25+16).12.½
= 41.6
= 246 cm²