GEOMETRY 4.8A Identify and describe right, acute, and obtuse angles.

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Presentation transcript:

GEOMETRY 4.8A Identify and describe right, acute, and obtuse angles. 4.8B Identify and describe parallel, intersecting, and perpendicular lines using concrete objects and pictorial models. 4.8C Use essential attributes to define two and three dimensional figures. Math Antics- Points, Lines, & Planes https://www.youtube.com/watch?v=k5etrWdIY6o

Point/Vertex

Line Segment

Line

Ray

The important thing to remember about parallel lines is that they will never cross, no matter how far they are extended. They are always exactly the same distance apart. Parallel The symbol ║ indicates parallel lines Journal Prompt: Write about why some item from the real world must have parallel lines.

Perpendicular The important thing about perpendicular lines is that there is a right angle where they meet or cross. The symbol ┴ indicates perpendicular lines.

Lines intersect where they cross each other. Intersecting Lines

Plane

Name a Geometric Term that best represents each object. Highway 2. Tip of a Marker 3. Screwdriver 4. Football Field 5. Grain of salt 6. Two way arrow 7. Meadow 8. Piece of Rope 9. Flashlight Beam 10. Extension Cord 11. Farm Field 12. Railroad Track

Right Angle

Acute LESS THAN 90°

Obtuse Angles GREATER THAN 90°

What is this? What is this? What is this? What is this?

What is this?

What is this?

Is this angle acute, right, obtuse, or straight?

Is this angle acute, right, obtuse, or straight?

Is this angle acute, right, obtuse, or straight?

Is this angle acute, right, obtuse, or straight?

Is this angle acute, right, obtuse, or straight?

Are these lines perpendicular, Parallel, or intersecting?

Are these lines perpendicular, Parallel, or intersecting?

Are these lines perpendicular, Parallel, or intersecting?

Are these lines perpendicular, Parallel, or intersecting?

Are these lines perpendicular, Parallel, or intersecting?

What did you learn?