An Interesting Fact!


Did you ever watch anybody hanging wallpaper? When you are hanging wallpaper it is very important to make sure that the fi rst strip is hung correctly, so that all the other strips can be lined up carefully beside it. If the vertical edge of the wallpaper strip, going from the ceiling to the fl oor, is not perfectly vertical, the whole job could be ruined.


So how can we make sure that we have a perfectly vertical line?


We use a plumb line. The plumb line was invented by the early Egyptians to make perfectly vertical lines. A plumb line is a string that is tied to a stone and with the help of gravity the string will always make a vertical line.


Angles


Take two straws and join them together at one end, as in this picture. When you slide one straw above the other, the space that is between the two straws at the join is called an angle. Angles can be different sizes.


1. Put these angles in order of size from smallest to biggest.


a) Answer = Right Angles


A right angle is the name for an angle that is a perfect corner, or ‘L’ shape. It can face any direction


b)


c)


168 Lines and Angles


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