1. Take a compass and draw a point O on the paper.


2. Put the pointed end of the compass on the point O and draw a circle around it.


3. Extend the compass to a distance of 3.7 cm and draw another circle around point O.


4. The circle with centre O and radius 3.7 cm is now drawn.

1. Draw a line from the centre O to any point on the circumference of the circle.


2. Measure the angle 72° using a protractor, starting from the line you just drew.


3. Draw another line, starting from the centre O and passing through the point where the angle 72° intersects the circle.


4. Erase the part of the circle that is outside the sector.


5. The sector with an angle of 72° is now drawn.

To draw a circle with centre O and radius 3.7 cm, we need to use a compass and draw two circles around point O. The first circle is drawn with the compass pointed at point O and extending to any distance. The second circle is drawn with the compass pointed at point O and extending to a distance of 3.7 cm.

To draw a sector with an angle of 72°, we need to draw a line from the centre O to any point on the circumference of the circle. Using a protractor, we then measure an angle of 72° starting from the line we just drew. We then draw another line starting from the centre O and passing through the point where the angle 72° intersects the circle. Finally, we erase the part of the circle that is outside the sector to get the desired shape.

In summary, drawing a circle with centre O and radius 3.7 cm and a sector with an angle of 72° involves using a compass, protractor, and basic geometry concepts.