Hitunglah luas daerah ABC berikut!

Langsung aja y

luas ∆ ABD
= ½ × (4+5) × 12
= 6 × 9
= 54 cm²

luas ∆ ACD
= ½ × 5 × 12
= 6 × 5
= 30 cm²

luas ∆ ABC
= 54 - 30
= 24 cm²

semoga berguna +_+

L ΔABC = L ΔABD - L ΔACD
= (1/2 x 9 x 12) - (1/2 x 5 x 12)
=54 - 30
=24 cm²