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a.) sebagun memiliki perbandingan sama
⇒ ab / km = 12/20
= 3/5
⇒ bc/ml = 9 / 15
= 3/5
⇒ ac/kl = 15/25
= 3/5
b.) ⇒ sudut A = sudut E
⇒ sudut F = sudut B
nomer 20
gunakan pitagoras