Area of Quadrant of a circle

 For area of circle we can use this three steps :

1. sector of a cicle = πr²θ/360°

2. Put θ=90°

3. Finally ,Area of Quadrant of a circle=πr²×90°/360°=(πr²)/4

Example:- If radius of circle, r=7 cm

Then area of Quadrant=πr²/4

={(22/7)×7×7}/4

={(22×7×7)}/7×4

=(11×7)/4

=(77/4) cm²