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a. KN=LM=4cm
MN=KL=6cm
RS KL
b. ----- = ----
ST LM
15 6
---- = ----
ST 4
maka, ST=10cm
TU=RS=15cm
RU=ST=10cm
4. a. AD=CD=3cm
CF =BC=6cm
b. CD CF
---- = ----
BC EF
3 6
--- = ---
6 EF
maka,EF = 12 cm