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x:(x+10)=12:20=3:5
5x=3(x+10)
5x=3x+30
2x=30
x=15
18. OM= V20^2-12^2= V400-144= V256= 16cm
LN= 2x12= 24cm
Luas= 1/2 x d1 x d2
252= 1/2 x LNxKM
252= 1/2 x 24 x KM
252= 12 xKM
KM= 21cm
KO= KM-OM= 21-16=5cm
KL=VKO^2+LO^2= V5^2+12^2= 13cm