Lesson: Areas of Circular Sectors Mathematics
In this lesson, we will learn how to find the area of a circular sector and solve problems that relate this area to the arc length and perimeter of the sector.
Write an expression for the area of a sector whose arc’s measure is radians, knowing that the expression for the area of a sector measuring degrees is .
Work out the area of the given shape, giving your answer accurate to two decimal places.
The radius of a circle is 21 cm and the angle of a sector is . Find the area of the sector giving the answer to the nearest square centimeter.