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I’m so lost right now please help me

I’m so lost right now please help me-example-1

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ok so because they are similar, the ratio of the measurement from the small to big one will be the same
ratio from big to small is 15/5 = 18/h
cross multiply and you’ll get 15h=90
h=6

proof: ratio of the base from big to small is 15/5=3
ratio of the height from big to small is 18/6 =3
User Vahid Tajari
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