Mathematics for IGCSE & O level - Mensuration (Section 4 - No. 47)
What information do you need to calculate the area of a sector of a circle?
The radius and the central angle of the sector
The diameter of the circle
The circumference
The area of the full circle
Обяснение
The area of a sector is a fraction of the total circle area, and that fraction is determined by the central angle.