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Kesebangunan dan Kongruen

AD/AB = AE/AC
6/10 = X/X+2
3/5 = X/X+2
3 (X+2) = 5X
3X + 6 = 5X
3X - 5X = -6
-2X = -6
X = -6/-2
X = 3 cm

AD/AB = DE/BC
6/10 = y/10
3/5 = y/10
3 x 10 = 5y
30 = 5y
y = 30/5
y = 6 cm

*semoga membantu. sukses selalu ^_^

k= ab/ad= 1.67
y= 10/1.67= 5.9