Answer: Half the difference of intercepted arcs.
- A Half the difference of intercepted arcs
- B Half the sum of intercepted arcs
- C Equals the central angle
- D 90°
Correct answer: A. Half the difference of intercepted arcs
Explanation: From external point, tangent touches at T (arc=0 from near side), secant cuts arcs m (near) and n (far). Angle=(n−m)/2 = half the difference of intercepted arcs. For tangent-secant, near arc is the tangent-point arc. Ans: Half the difference 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