Make a sector of angle `90^(@)` in a circle of radius 3.5 cm.

Explanation

Steps of construction :
1. Draw a circle of radius 3.5 cm.
2. Mark the centre as C.
3. Mark a point A on the circle and join A to C.
4. Mark a point B on the circle such that `angleACB=90^(@)` with the help of a protractor.
5. Join BC.
Shade the region bounded by the radii AC and BC, the arc AB.