Page 133 - Math Smart - 7

6.2.3 Drawing acute angles

Let us draw ZDEF = 56°.

To draw an acute angle:

1 Use your ruler. Draw a line EF.
This is one arm of the angle.
Mark point E as the vertex.

Place the centre of the protractor on line
EF. Make sure the centre mark of the
protractor falls on point E, the vertex.
Make sure the baseline of the protractor is
sitting on the arm of the angle.

5 Find the 56° mark on the inner scale. Mark
a point at the edge of the protractor. Label
the point, D.

-if!
Use a ruler to draw a straight line from the
vertex, E, to the point, D.
This forms the second arm of the angle.
The angle (zlDEF) is 56°.

Drawing obtuse angles

Similarly, we can draw zlPQR = 168°.

To draw an obtuse angle:

' Use your ruler. Draw a straight line PQ and
mark point Q as the vertex.

Next, place the protractor on line PQ. Make
sure that the centre mark of the protractor
falls on point Q, the vertex.