A sector has central angle 144° and radius 7 cm. Another sector with the same radius has a central angle 4π/5 radians. What is the ratio of their areas?

উত্তর দেখান ও ব্যাখ্যা

উত্তর: (A) 1:1

ব্যাখ্যা

4π/5 rad = 144°, so the areas are equal.