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7×24:168 (d)
AD = BD = 7 cm ( alas)
BC = AC = 25cm ( sisi )
DC = tinggi = t =?
DC = BC - AD
= 25²- 7²
= 625 - 49
= √576
DC = 24 cm
Luas ∆ ABC = 1/2 × alas × tinggi
= 1/2 × (7 × 24)
= 84 cm²