From the proportion we can easily find the final sector area formula. A r L 2 A r L 2. Circle Sector Formulas Area Arc Length Maths Algebra Formulas Learning Mathematics Math Methods Let the area of ΔAOB be A ΔAOB. . Area Of A Circle Formula. From the proportion we can easily find the final sector area formula. Up to 10 cash back area of the circle and then subtract the area of the sector formed by the acute angle. The formula used to calculate the area of a sector of a circle is. There are two formulas of a sector. Lets study how to determine the area of a sector. A sector always begins at the circles centre. The area of a sector of a circle is the amount of space occupied inside a sector of a circles border. Here is a three-tier. Area of sector A. Area of a sector pi r2 θ 360. Angle of sector at center 60 Formula for area of a sector θ360πr 2. Areaofasector fracAngle360c