Identifying Relationships between Angles

• math

00:41

Prior Knowledge Check
What are lines that extend forever, and never cross, called?

01:17

Remember!

The point at which lines cross is called an 

intersection.

01:46

Remember!

The name of an angle is based on the labels of each point!

For example, this is angle ABC because each "point" has a label of either A, B, or C!

03:13

Ah-ha!

Arcs also name angles!

For example,

Angle ABC can also be Arc ABC!

03:40

Perpendicular Lines

Lines that cross and form "perfect T's" or "perfect squares" are called perpendicular lines!

***With perpendicular lines, ALL ANGLES ARE EQUAL!***

03:57

Ah-ha!

ALL right angles have a tiny square in their corner, which is formed by perpendicular lines.  If it does not have a square in the corner, more than likely, it's not a right angle!

04:46

Review

Right angle - Forms a perfect "L" and has a square inside its angle; equal to 90 degrees

Acute angles - smaller than a right angle; less than 90 degrees

Obtuse angles - bigger than a right angle; more than 90 degrees

05:13

What kind of angle is this?

1. obtuse
2. straight
3. right
4. acute

05:13

What kind of angle is this?

1. acute
2. obtuse
3. right
4. straight

05:13

What kind of angle is this?

1. acute
2. obtuse
3. straight
4. right

05:40

Complementary Angles

Complementary angles are angles that are formed by 2 angles that, when you add the measurement of both of their angles and combine them, form a right angle.

**The two angles together equals 90 degrees!***

05:57

Supplementary Angles

Supplementary angles are formed when two angles, whose individual angles are combined, add up to a straight angle.

***The two angles together equal 180 degrees!***

06:19

Lines that point in the same direction and never touch are called...

1. perpendicular
2. right
3. straight
4. parallel

07:42

Time to Practice!

Try your hand at your Scootpad assignment!  Once you're finished with that, continue practice on Prodigy!