BILATERAL

SYMMETRY

ACTIVITY

DRAWING PARALLEL LINES

1. Put the hypotenuse of the 45º square over the line.

2. Put the hypotenuse of the 30º square on one of the

cathetus of the 45º square.

3. Hold the 30º square tight and move the 45º square

until the right place.

4. Draw the parallel line on the hypotenuse of the 45º

square.

DRAWING PARALLEL LINES

DRAWING PERPENDICULAR LINES

1. Put the set of squares as if you were going to make

parallel lines.

2. Turn the 45º square to stand on the other cathetus.

3. Hold the 30º square tight and move the 45º square

until the right place.

4. Draw the perpendicular line on the hypotenuse of the

45º square.

DRAWING PERPENDICULAR LINES

SYMMETRY: COPYING A FIGURE

Given half a figure and its symmetry axis, draw the

other half:

1. Draw perpendicular lines to the axis throwgh the

most important points of the figure

2. Point with the compass on the intersection of the

parallel line and the axis

3. Open the compass to the point on the figure

4. Turn the compass and draw an arc on the parallel line

SYMMETRY: COPYING A FIGURE

CHECKING THE CONSTRUCTION

Cut the silhouette and fold

axis to check the accuracy of

the construction!!!!