- Horizontal / Vertical
Horizontal denotes any object which is parallel to the ground. Vertical denotes an
object which is at right angle to the horizontal plane.
To teach the concept to the child, provide him with a sheet of paper in which two
embossed lines meet at right angle and two others are parallel to each other. The
embossed lines show that one line is perpendicular to the ground and the other is
parallel to it. Related concepts are parallelism, perpendicularity, right angle etc.,
Parallel Perpendicular
- Intersection
If two lines meet at a point then they are said to be intersecting lines, and the point
at which they meet is called the point of intersection.
A sheet of paper may be given to the child. Ask the child to fold the paper to form a
crease. Ask the child to fold the paper once again to form another crease so as to
intersect the former at a point. Now explain to the child that the two lines are
intersecting as they meet at a point, and the meeting point is called as the point of
intersection.
- Bisection
When the point of intersection divides the two line segments exactly into two halves
then the lines are said to bisect each other and the point at which they meet is called
as the point of bisection. A sheet of paper in which two line segments, one horizontal
and the other vertical, which divide the given paper into halves on either way can be
prepared and given to the child. By exploration, the child will be able to understand
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