Segitiga ACD berlaku rumus pythagoras.
Maka CD² = AC² - AD²
CD² = 20² - 12²
CD = √400 - 144
CD = √256
CD = 16
Maka luas segitiga ACD = 1/2 × 12 × 16
= 96
Luas segitiga ABC = 1/2 × 15 × 20
= 150
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Segitiga ACD berlaku rumus pythagoras.
Maka CD² = AC² - AD²
CD² = 20² - 12²
CD = √400 - 144
CD = √256
CD = 16
Maka luas segitiga ACD = 1/2 × 12 × 16
= 96
Luas segitiga ABC = 1/2 × 15 × 20
= 150