Tolong jwb no 2,4,9,10,11

11. DC = √15^2 - 9^2
= √225 - 81
= √144
= 12
bc = √12^2 + 16^2
=√ 144 + 256
=√400
=20
keliling = 20 + 16 + 9 + 15
= 60 (c)