A long sheet of metal cm wide is folded into a V-shaped trough by bending up two equal flaps of width cm each at angle . The cross-sectional area is maximized at
- A
- Bcheck_circle
- C
- D
Explanation
Cross-section area = base × (height)/... For two flaps bent at angle from vertical, area is maximized when the flaps are horizontal: (open trough). (Standard result depends on geometry; the value here is for the V-shape with vertical-from-flaps reading.)