Tolong dijawab Nomor 12 , 14 , dan 16

12. AB=BE=CD= 8cm
BC=DE= 11 cm
K.ACDE = AB+BC+CD+DE+ED
= 8+11+8+11+11,3 = 49,3cm
14.
16. QR =20cm
QS = x
RS = QR−QS = 20−x
RS²=PR²−PS²→PS²=144−(20−x)²
QS²=PQ²−PS²→PS²=256−x²
144−(20−x)²=256−x²
144−400+40x−x²=256−x²
40x−x²+x²=256−144+400
40x=512
x=512/40
x=12,8
PS²=256−(12,8)²=256−163,84=92,16
PS=√92,16
=9,6cm