Understanding Angle Concepts
Explore different types of angles, such as acute, right, obtuse, and reflex angles. Learn about the properties of angles, including why a straight line measures 180 degrees and why a full turn is 360 degrees. Discover how to determine missing angles and the significance of angles on a straight line and around a turn.
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Presentation Transcript
Date Angles Starter 1) 4236 5 2)9428 5 3) 3455 5 4) 4895 x 5 5) 5984 x 15 6) 8284 x 25
What angles can you see? What do you know about these angles? Where can you see a reflex angle?
Acute Less than 90 degrees Right-angle Exactly 90 degrees Obtuse More than 90 but less than 180 degrees Reflex More than 180 but less than 360 degrees What are 180 degrees and 360 degrees?
What is the missing angle? 132 How do you know the angle has to be smaller than 90 degrees? Angles on a straight line equal 180 degrees
What is the missing angle? 118 Find another way of finding the answer. Which is the most efficient method? Why? Angles on a straight line equal 180 degrees
What is the missing angle? 38 Angles on a straight line equal 180 degrees Why is there only one possible answer?
What is the missing angle? 53 38 Angles on a straight line equal 180 degrees Where might people go wrong with this question? Why?
What is the missing angle? Angles around a turn equal 360 degrees What types of angles do you have? How do you know?
What is the missing angle? Is there another way to find the answer? Which is the most efficient method? Angles around a turn equal 360 degrees
What does a equal? Angles around a turn equal 360 degrees What does this teach us about opposite angles?
Around a point, opposite angles are the same. Therefore b and d would measure the same and a and c would measure the same. The total angles would still equal 360 degrees as it is a full turn.
Angles around a turn equal 360 degrees Opposite angles are equal Is there more than one way to find the answer? If so, how?
Angles around a turn equal 360 degrees Opposite angles are equal Angles on a straight line equal 180 degrees
Angles in a quadrilateral equal 360 degrees
