2022 · Q88
What is the radius of the circle inscribed in a triangle whose sides are 4 cm, 7.5 cm and 8.5 cm?
Elementary MathematicsCircles
- A1.5 cm
- B2 cm
- C2.5 cm
- D3 cm
Explanation
4²+7.5² = 72.25 = 8.5², so it is right-angled; inradius r = (4+7.5-8.5)/2 = 1.5 cm. Hence the keyed option is A.