Answer: 5√2 cm.
- A 5√2 cm
- B 5 cm
- C 10 cm
- D 7 cm
Correct answer: A. 5√2 cm
Explanation: Triangle is right-angled isosceles. Chord² = r² + r² = 2r². 100 = 2r². r = 5√2 cm.
Three standard 3D solids and their key formulas: a cylinder's volume scales with the full height, a cone's volume is exactly one-third of the cylinder with the same base and height, and a sphere's volume and surface area both follow distinct r-based formulas worth memorising separately.
Concept context
Perimeters, areas, and volumes of 2D and 3D shapes