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Complementary and Supplementary Angles - Identify and Find Missing Angle Measures

Learn how to identify complementary and supplementary angles and find missing angle measures. Practice with examples and five-minute checks.

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Complementary and Supplementary Angles - Identify and Find Missing Angle Measures

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  1. Lesson Menu Main Idea and New Vocabulary NGSSS Key Concept: Pairs of Angles Example 1: Identify Angles Example 2: Identify Angles Example 3: Find a Missing Angle Measure Five-Minute Check

  2. Identify complementary and supplementary angles and find missing angle measures. • complementary angles • supplementary angles Main Idea/Vocabulary

  3. MA.8.G.2.2 Classify and determine the measure of angles, including angles created when parallel lines are cut by transversals. NGSSS

  4. Key Concept

  5. Identify Angles Identify the pair of angles as complementary, supplementary, or neither. Answer: Since 128° + 52° = 180°, the angles are supplementary. Example 1

  6. Identify the pair of angles as complementary, supplementary, or neither. A. complementary B. supplementary C. neither Example 1 CYP

  7. Identify Angles Identify the pair of angles as complementary, supplementary, or neither. x and y form a right angle. Answer: So, the angles are complementary. Example 2

  8. Identify the pair of angles as complementary, supplementary, or neither. A. complementary B. supplementary C. neither Example 2 CYP

  9. Find a Missing Angle Measure ALGEBRA Find the value of x. Since the two angles form a straight angle, they are supplementary. Example 3

  10. Find a Missing Angle Measure 56 + x = 180 Write the equation. – 56– 56Subtract 56 from each side. x = 124 Answer: So, the value of x is 124. Example 3

  11. ALGEBRA Find the value of x. A. 30 B. 50 C. 60 D. 80 Example 3 CYP

  12. Identify the pair of angles as complementary, supplementary, or neither. A. complementary B. supplementary C. neither Five Minute Check 1

  13. Identify the pair of angles as complementary, supplementary, or neither. A. complementary B. supplementary C. neither Five Minute Check 2

  14. Identify the pair of angles as complementary, supplementary, or neither. A. complementary B. supplementary C. neither Five Minute Check 3

  15. Find the value of x. A. 55 B. 65 C. 145 D. 180 Five Minute Check 4

  16. Tell whether the following statement is true or false. Angles are complementary if the sum of their measures is 180°. A. true B. false Five Minute Check 5

  17. 1 and 2 are complementary angles and m1 = 57°. What is the measure of 2? A. 33° B. 43° C. 57° D. 123° Five Minute Check 6

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