lines and angles
![Picture](/uploads/4/6/1/6/46161329/1702505.gif?465)
Lines
There are two sets of lines to remember: parallel and prependicular.
Parallel lines never meet
Just like train tracks
Just like the two l's in the word...... p a r a l l e l
Perpendicular lines always cross over each other.
Angles
There are 6 names for angles...the list is in order of the smallest to the largest
1. Acute angle
2. Right angle
3. Obtuse angle
4. Straight line
5. Reflex angle
6. Full turn
Do not confuse these names with TRIangles (more about those later though).
Using a protractor
Make sure that you line up the cross in the middle with the angle you are measuring.
Make sure the straight line and the zero (not 180) line up with your angle.
Count around the protractor until the angle matches the lines on your protractor just like how you would measure a straight line with a ruler.
TIP: use a very sharp point on your pencil to get the best accuracy
Triangles
There are four types of triangles. The easiest one to spot is the right angled one.
This is because you can see the two lines meeting and you can draw a small square in that corner just like the right angle. Hence right angle triangle.
The other types are easy too once you learn the differences.
Equilateral triangles have a link to their name too.
EQUilateral meaning that features are equal. All angles are the same size and all sides are the same length
Isosceles has pairs. Two sides the same, the third not. Two angles the same size, the third not.
They have a way of showing this in a diagram (see picture below)
Scalene is the one where nothing is the same. All angles are different sizes and all lengths are different sizes.
There are two sets of lines to remember: parallel and prependicular.
Parallel lines never meet
Just like train tracks
Just like the two l's in the word...... p a r a l l e l
Perpendicular lines always cross over each other.
Angles
There are 6 names for angles...the list is in order of the smallest to the largest
1. Acute angle
2. Right angle
3. Obtuse angle
4. Straight line
5. Reflex angle
6. Full turn
Do not confuse these names with TRIangles (more about those later though).
Using a protractor
Make sure that you line up the cross in the middle with the angle you are measuring.
Make sure the straight line and the zero (not 180) line up with your angle.
Count around the protractor until the angle matches the lines on your protractor just like how you would measure a straight line with a ruler.
TIP: use a very sharp point on your pencil to get the best accuracy
Triangles
There are four types of triangles. The easiest one to spot is the right angled one.
This is because you can see the two lines meeting and you can draw a small square in that corner just like the right angle. Hence right angle triangle.
The other types are easy too once you learn the differences.
Equilateral triangles have a link to their name too.
EQUilateral meaning that features are equal. All angles are the same size and all sides are the same length
Isosceles has pairs. Two sides the same, the third not. Two angles the same size, the third not.
They have a way of showing this in a diagram (see picture below)
Scalene is the one where nothing is the same. All angles are different sizes and all lengths are different sizes.