Today we embarked on a new journey to Egypt where we explore how the pyramids were built in Egypt. Who built the pyramids? How is it possible that the shapes and lines of the building were perfectly straight even without the use of the ruler or protractor? Could it be the aliens who built it?
Let's take some time to reflect what you've learned today.
1) What are perpendicular lines?
The word , Perpendicular, means "at right angle". So perpendicular lines simply mean two lines coming together to form a right angle.
Perpendicular lines are drawn using a ruler and a set square.
Step 1: Use a ruler to draw the first straight line.
Step 2: Place one edge of a set-square containing the right angle against the line.Then, using your pencil, draw a vertical straight line downwards to form the second line which meets the first straight line.
Step 3: Mark out the right angle and label the angle as 90 degrees.
2) What are parallel lines?
Parallel lines are two lines which are placed same distance apart. These two lines will never meet. The word parallel means "side by side and having the same distance continuously between them".
Parallel lines are drawn using a ruler and a set square.
Step 1: Place one edge of a set-square containing the right angle along the given line. Then, place a ruler against the other edge of the set-square containing the right angle.
Step 2: Slide the edge of the set-square along the ruler until the other edge passes through the given point. Then, use this edge to draw the line parallel to the given line through the given point.
Step 3: Mark both parallel lines with an arrowhead to indicate both lines are parallel.
Interesting questions for you to ponder
1) Who invented the set square?
2) Why is it called a set square and not a triangle? ( Amaarul's question)
3) Why are parallel lines called parallel ? Can we call them copy lines? ( Amaarul's question)
4) Why are we learning about perpendicular lines and parallel lines? What are they used for? ( Hint: Related to the construction of pyramids)
5) Who came up with the idea of maths? ( Zi Xing's question)
That's all folks. Happy weekend!
Miss Dee
Don't they look 'parallel'?
Being 'parallel'
If you aren't 'parallel, then you must be 'perpendicular', right?
Get it?
