
A circle is a two-dimensional shape whose circumference consists of multiple points which are equidistant from a fixed point in the inside of the shape. A circle when cut into four equal parts gives 4 quadrants. Therefore, a quadrant is the one-forth part of a circle. It can also be defined as a sector of a circle formed by two radii intersecting each other at right angles.
The area of a quadrant of a circle can be derived from the area of a circle. For that, we must know certain points about the area of a circle.
diameter = 2 . radius
d = 2 . r
which impliesr = d/2
circumference/perimeter = 2 . π. r
circumference/perimeter = 2 . π . d/2
area = π . r²
area = π . (d/2)²
The area of a quadrant of a circle can be calculated by two methods.
Area of circle = π . r²
One-forth area of circle = ¼ . area of circle
¼ . Area of circle = ¼ . π . r²
Area of quadrant = ¼ . π . r²
Also, Area of quadrant = ¼ . π . (d/2)²
Area of a sector of a circle = (θ/360º) . π . r²
where θ is equal to 90° because quadrant of a circle is a type of sector having a right angle.Area of a quadrant = area of sector of a circle of θ as 90°
Area of a quadrant = (90°/360°) . π . r²
Area of a quadrant = 1/4 . π . r²
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