2022 · Q86
In a right triangle ABC, BD is perpendicular on hypotenuse AC. If AC = 9 cm and AD = 4 cm, then what is AB + BC approximately equal to?
Elementary MathematicsGeometry: Lines, Angles and Triangles
- A12 cm
- B12.2 cm
- C12.4 cm
- D12.6 cm
Explanation
AB² = ADxAC = 36 gives AB = 6; BC² = CDxCA = 45 gives BC ≈ 6.71. Their sum ≈ 12.71, closest to 12.6 among the options. Hence the keyed option is D.