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Sebuah segitiga sama kaki memiliki tinggi 21cm dan luas 189cm .brp cm panjang alas segitiga tersebut?

Rani Maharani

Sebuah segitiga sama kaki memiliki tinggi 21cm dan luas 189cm .brp cm panjang alas segitiga tersebut?

Pembahasan

Luas segitiga = ¹/₂ x alas x tinggi

Diketahui:

tinggi = 21 cm

luas = 189 cm²

Ditanya: panjang alas segitiga

Jawab:

luas = ¹/₂ x alas x tinggi

189 = ¹/₂ x alas x 21

189 x 2 = alas x 21

378 = alas x 21

alas = 378 / 21 = 18 cm

Jadi, panjang alas segitiga tersebut adalah 18 cm.

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