Identify Angles TEKS 4.6A

Angles, Perpendicular and Parallel Lines

Math 4.6A

Acute Angle

Measure less than 90^o

So little and cute

Right Angle

An angle of 90°, as in a corner of a square or at the intersection of two perpendicular straight lines.

Obtuse Angles

measure more than 90^o

the big guys!

Straight Angle

A straight angle always forms a straight line. The value of the straight angle is 180°.

Multiple Choice

What do we call this type of angle (measure exactly 90^o)?

• acute

• right

• obtuse

• straight

Multiple Choice

What do we call this type of angle (measures more than 90^o)?

• acute

• right

• obtuse

• straight

Multiple Choice

What do we call this type of angle (measures exactly 180^o)?

• acute

• right

• obtuse

• straight

Poll

What type of angle is this?

• obtuse

• acute

• right

• straight

Poll

What type of angle is this?

• obtuse

• acute

• right

• straight

Poll

What type of angle is this?

• obtuse

• acute

• right

• straight

Poll

What type of angle is this?

• obtuse

• acute

• right

• straight

Multiple Choice

Identify the type of angle:

• right angle

• straight angle

• acute angle

• obtuse angle

Multiple Choice

Identify the type of angle:

• right angle

• straight angle

• acute angle

• obtuse angle

Multiple Choice

Identify the type of angle:

• right angle

• straight angle

• acute angle

• obtuse angle

Now let's answer some questions!

Choose the best answer for each.

Multiple Choice

Which pair of line segments appear to be parallel?

• AB and CD

• AG and CD

• AC and GD

• DE and BC

• none of these

Multiple Choice

Which pair of line segments appear to be perpendicular?

• AB and CD

• FE and DE

• AG and GF

• AB and AG

• none of these

Multiple Choice

Which pair of line segments appear to be parallel?

• AG and DE

• AB and GF

• BC and CD

• FE and BC

• all of these

Multiple Choice

Which pair of line segments appear to be perpendicular?

• AB and BC

• FE and CD

• CD and DE

• BC and CD

• all of these

Multiple Choice

Which pair of line segments appear to be parallel?

• AB and GF

• AG and CD

• ED and BC

• FE and ED

• none of these

Multiple Choice

Which angle is an obtuse angle?

• ∠ CDE

• ∠ BCD

• ∠ AGF

• ∠ FED

• all of these

Multiple Choice

Which angle is an acute angle?

• ∠ BCD

• ∠ CDE

• ∠ FED

• ∠ AGF

• none of these

Multiple Choice

Which angle appears to be a right angle?

• ∠ GFE

• ∠ AGF

• ∠ EDC

• ∠ BCD

• all of these

Multiple Choice

Which angle is an acute angle?

• ∠ GAB

• ∠ BCD

• ∠ CDE

• ∠ GFE

• all of these

Multiple Choice

Which angle is an obtuse angle?

• ∠ EDC

• ∠ GFE

• ∠ BAG

• ∠ ABC

• none of these

Multiple Choice

Mrs. Royster wants her door to open to a right angle. It is already opened 73°. How many more degrees does she need to open it to have it open at a right angle?

• Straight

• 11⁰

• 13⁰

• 17⁰

Multiple Select

Identify all parallel lines

• Lines BL and CE

• Lines BL and GP

• Lines AF and KM

• Lines DE and KM

• Line AF and ML

Multiple Select

Identify all the intersecting lines

• Lines CH and DE

• Lines CH and BL

• Lines CH and KM

• Lines DE and BL

• Lines AF and KM

Multiple Select

Identify all the perpendicular lines

• Lines CH and DE

• Lines CH and BL

• Lines CH and KM

• Lines DE and BL

• Lines AF and KM