Angles and Lines in Geometry

Introduction to Lines and Angles

Goal: Students will identify  and classify lines and angles.

Directions:

This is an interactive presentation. While we go through the lesson there will be pictures, information, and questions for you to interact with.         

*If you have questions, please put up the hand reaction or type it in the chat to MRS. GOELMAN. 

Lines

• a straight or curved continuous extent of length 

• SEGMENT: has 2 end points

• LINE: goes on for ever on both sides

• RAY: has 1 endpoint and 1 never ending side

  
  
  

• **IN THE CHAT: Note where you see a line, line segment, or ray.

Multiple Select

Choose all of the pictures that show a line segment.

Perpendicular and Parallel Lines

• type of set of lines

• can be identified by intersection

Perpendicular Lines

• 2 lines that intersect or cross

• must cross at 90 degrees or a right angle

• if the lines do not make a 90 degree angle = intereseting lines NOT perpendicular

Multiple Choice

Choose the picture that shows perpendicular lines.

Parallel Lines

• 2 lines that NEVER intersect

• the length of each line does not matter

Multiple Select

Choose all of the pictures that show parallel lines.

Angles

• form when 2 lines meet

• can be classified by the measurement between the two lines

• can stand alone 

• can be part of a 2D or 3D figure

Right Angle

• shaped like an L

• always equals 90°

Acute Angle

• any degree less than 90

Obtuse Angle

• any degree more than 90

Straight Angle

• always 180 degrees

• looks like a straight  line

A small break before we start our practice.