NCERT 5th Class (CBSE) Mathematics: Polygons And Circles

Construction of Squares and Rectangles

(a) you can draw a square or a rectangle with the help of a set square.

A set square is a drawing instrument with a right angle. We use it with a ruler to get sharp corners of squares and rectangles.

Draw a rectangle ABCD with sides 4 cm and 6 cm.

(b) You can also use a protractor to draw squares and rectangles.

Draw square PQRS with sides of 5 cm.

CIRCLES

What shape do these pictures remind you of?

All these objects remind us of the shape of a circle.

A circle is a simple closed curve. It is made of a curved line. ‘O’ is the Center of the circle. We can name the circle by its center. This is circles O.

This is the radius of the circle. The radius is a line segment that runs between the circle and its center. This is  radius OP. We can have several radii all of the same length starting from O going to other points on the circle. This is because all the points on the circle are at an equal distance from the center.