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= 30^2-18^2
= 900-324 = 576
=√576 = 24.
AB:DE
BC:EC
AC:DC
pakai rumus kesebangunan nanti ketemu DE= 6
DC= 8
rumus segitiga 1/2 x axt
1/2x 10x 6 = 30
30DE = 18.10
30DE = 180
DE = 180/30
DE = 6 cm
L. CDE = 1/2 x a x t
= 1/2 x 10 x 6
= 5 x 6
= 30 cm²