Answer: Half the sum of intercepted arcs.
- A Half the sum of intercepted arcs
- B Half the difference of intercepted arcs
- C The sum of intercepted arcs
- D The central angle
Correct answer: A. Half the sum of intercepted arcs
Explanation: Chords PQ and RS intersect at point X inside the circle. Inscribed angle theorem gives ∠PXR=(arc PR + arc QS)/2. The angle equals half the sum of the two intercepted arcs (near and far). Ans: Half the sum of intercepted arcs.
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