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Untuk mempermudah, maka pisahkan segitiga tersebut menjadi 2 buah segitiga yang sebanding- EC/AB = DC/AC
=}→ 8/AB = 10/15
→ 8. 15 = 10. AB
→ 120 = 10. AB
AB= 120/10
AB= 12 cm → Tingginya
- DE/BC = DC/AC
→ 6/BC = 10/15
→ 6. 15 = 10. BC
→ 90 = 10. BC
BC= 90/10
BC= 9 cm → Alasnya
Maka:
Luas Segitiga ABC
= 1/2 × Alas × Tinggi
= 1/2 × 9 cm × 12 cm
= 4,5 cm × 12 cm
= 54 cm² → Opsi A
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