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= 1/2 x 11 x 12
= 11 x 6
= 66 cm²
Cara 1 :
Luas segitiga besar - Luas segitiga kecil
= ( 1/2 x 16 x 12 ) - ( 1/2 x 5 x 12 )
= 96 - 30 = 66 cm2
Cara 2 :
Luas segitiga ABC ( langsung )
alas = 11. tinggi = 12 ( SISI TEGAK / CD )
Luas = 1/2 x 11 x 12 = 66 cm2