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Triangle Angles

Learn about angles and triangles in this comprehensive overview. Discover the definition of an angle, how supplementary and complementary angles interact, and the distinctions between interior and exterior angles. Explore the types of angles: right, obtuse, and acute, and how they apply to triangles. Understand how to classify triangles based on their angles and side lengths, such as scalene, isosceles, and equilateral. Test your knowledge with engaging pop quizzes that reinforce key concepts about angles and triangles.

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Triangle Angles

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  1. Triangle Angles

  2. What is an angel?…I mean ANGLE! • Two rays with a common endpoint form an angle

  3. Supplementary & Complimentary Angles • Two angles are supplementary if they add up to 180° - forming a straight line • Two angles are complimentary if they add up to 90°

  4. Exterior and Interior Angles • Interior angles are inside of the shape • Exterior angles are formed when a line of a shape is extended

  5. The exterior and interior angle in the picture are an example of angles. • Complimentary • Supplementary

  6. Pop Quiz: A triangle has sides and angles. • Two • Three • Four • Five

  7. Pop Quiz: The three interior angles of a triangle add up to how many degrees? • 90° • 180° • 360°

  8. Types of Angles

  9. The following is a(n) angle. • Right • Obtuse • Acute

  10. When painting, a ladder would be set to form a(n) angle with the ground. • Right • Obtuse • Acute

  11. Naming Triangles Using Angles

  12. Classify the triangle based on its angle measures. • Right Triangle • Obtuse Triangle • Acute Triangle

  13. An obtuse triangle has one angle with a measure greater than 90° and two angles that are less than 90° • True • False

  14. In a right triangle, the two acute angles are… • Complimentary • Supplementary

  15. Classifying triangles by side lengths

  16. Classify the triangle. • Scalene • Isosceles • Equilateral

  17. Classify the triangle. • Acute Isosceles • Obtuse Isosceles • Acute Scalene • Obtuse Scalene

  18. Classify the triangle. • Right Scalene • Right Isosceles • Acute Isosceles • Obtuse Isosceles

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