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a)ΔADE sebangun Δ ECB
<D = <C = 90°
<E = < B
<A = <E
b). ?
2) ΔOMN sebagun ΔOPQ
<O=<O
<M = <P
<N = <Q
OM/MN = OP/PQ
OM/8 = (OM+3)/20
20 OM = 8(OM+3)
20OM = 8 OM + 24
12 OM = 24
OM = 2
ΔMON sebagun ROS
OR/SR = OM/ MN
OR/12 = 2/8
OR = 12(2)/8 = 24/8 = 3
MR = MO + OR = 2 + 3 = 5