Perpendicular Lines Two lines at right angles 90

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Perpendicular Lines Two lines at right angles (90 o) to each other Parallel Lines

Perpendicular Lines Two lines at right angles (90 o) to each other Parallel Lines Straight lines that are always the same distance apart and never meet

Degrees: Measuring Angles We measure the size of an angle using degrees. Example: Here

Degrees: Measuring Angles We measure the size of an angle using degrees. Example: Here are some examples of angles and their degree measurements.

Protractor A device used to measure angles.

Protractor A device used to measure angles.

Types of Angles Right Angle Acute Angle Obtuse Angle

Types of Angles Right Angle Acute Angle Obtuse Angle

Right Angles • Angles with one corner equal to 90 degrees • It doesn’t

Right Angles • Angles with one corner equal to 90 degrees • It doesn’t matter which way the corner is facing

A“cute” Angles • Angles with one corner less than 90 degrees • It doesn’t

A“cute” Angles • Angles with one corner less than 90 degrees • It doesn’t matter which way the corner is facing

Obtuse Angles • Angles with one corner greater than 90 degrees • It also

Obtuse Angles • Angles with one corner greater than 90 degrees • It also doesn’t matter which way the corner is facing

Lets Test Your Knowledge Here are some angles. Are they right, acute, or obtuse?

Lets Test Your Knowledge Here are some angles. Are they right, acute, or obtuse?

Complementary Angles Two angles are called complementary angles if the sum of their degree

Complementary Angles Two angles are called complementary angles if the sum of their degree measurements equals 90 degrees. Example: These two angles are complementary.

These two angles can be "pasted" together to form a right angle! Making it

These two angles can be "pasted" together to form a right angle! Making it complementary!

Supplementary Angles Two angles are called supplementary angles if the sum of their degree

Supplementary Angles Two angles are called supplementary angles if the sum of their degree measurements equals 180 degrees. Example: These two angles are supplementary.

These two angles can be "pasted" together to form a straight line which is

These two angles can be "pasted" together to form a straight line which is always 180 degrees!

Vertical Angles For any two lines that meet, such as in the diagram below,

Vertical Angles For any two lines that meet, such as in the diagram below, <AEB and <DEC are called vertical angles. <BEC and <AED are also vertical angles. Vertical angles have the same degree measurement.

ADD TO NOTES: Adjacent Angles Two angles are called adjacent angles if they share

ADD TO NOTES: Adjacent Angles Two angles are called adjacent angles if they share a common side and a common vertex Example: These adjacent angles. Who can name them?

Let’s use your prior knowledge to find the measures of the missing angles! F

Let’s use your prior knowledge to find the measures of the missing angles! F E 20 70 90 D C 70 J G 90 20 H

Let’s try another! B C 68 A 52 60 G 52 60 68 F

Let’s try another! B C 68 A 52 60 G 52 60 68 F E D

Angles Turns Right Angles mdhazrin Angles Turns RightAngles Turns Right Angles mdhazrin Angles Turns Right
Parallel Perpendicular Lines Parallel and Perpendicular Lines TheParallel Perpendicular Lines Parallel and Perpendicular Lines The
3 4 Perpendicular Lines 3 4 Perpendicular Lines3 4 Perpendicular Lines 3 4 Perpendicular Lines
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Slopesofof Paralleland and Perpendicular Slopes Lines Perpendicular LinesSlopesofof Paralleland and Perpendicular Slopes Lines Perpendicular Lines
Slopesofof Paralleland and Perpendicular Slopes Lines Perpendicular LinesSlopesofof Paralleland and Perpendicular Slopes Lines Perpendicular Lines
Parallel and Perpendicular Lines Parallel and Perpendicular LinesParallel and Perpendicular Lines Parallel and Perpendicular Lines
Parallel and Perpendicular Lines Parallel Lines Two linesParallel and Perpendicular Lines Parallel Lines Two lines
Angles adjacents Angles complmentaires Angles supplmentaires Angles oppossAngles adjacents Angles complmentaires Angles supplmentaires Angles opposs
Angles Estimating angles Drawing angles mdhazrin Angles EstimatingAngles Estimating angles Drawing angles mdhazrin Angles Estimating
Section 3 1 Lines and Angles Perpendicular LinesSection 3 1 Lines and Angles Perpendicular Lines
Angles LO To identify right angles acute anglesAngles LO To identify right angles acute angles
Parallel Lines and Angles Vertical Angles Vertical AnglesParallel Lines and Angles Vertical Angles Vertical Angles
Lines and Angles Geometry PARALLEL LINES Two linesLines and Angles Geometry PARALLEL LINES Two lines
Complementary and Supplementary Angles Complementary Angles Two anglesComplementary and Supplementary Angles Complementary Angles Two angles
Slopesofof Paralleland and Perpendicular 4 9 Lines PerpendicularSlopesofof Paralleland and Perpendicular 4 9 Lines Perpendicular