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ΔABCsiku siku , AB= 5 cm, AC = 12 cm dan AC = 13 cm

Luas = 1/2 alas x tinggi
L  = 1/2 (AB)(AC)
L = 1/2 (5)(12)
L = 30 cm²

L = ½ x a x t
= ½ x 5 cm x 12 cm
= ½ x 60 cm
= 30 cm²