Main Idea and New Vocabulary Key Concept: Pairs of Angles Example 1: Identify Angles Example 2: Identify Angles Example 3: Find a Missing Angle Measure Lesson Menu
Identify complementary and supplementary angles and find missing angle measures. complementary angles supplementary angles Main Idea/Vocabulary
Key Concept
Answer: Since 128° + 52° = 180°, the angles are supplementary. Identify Angles Identify the pair of angles as complementary, supplementary, or neither. Answer: Since 128° + 52° = 180°, the angles are supplementary. Example 1
Identify the pair of angles as complementary, supplementary, or neither. A. complementary B. supplementary C. neither Example 1 CYP
x and y form a right angle. 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
Identify the pair of angles as complementary, supplementary, or neither. A. complementary B. supplementary C. neither Example 2 CYP
Find a Missing Angle Measure ALGEBRA Find the value of x. Since the two angles form a straight angle, they are supplementary. Example 3
Find a Missing Angle Measure 56 + x = 180 Write the equation. – 56 – 56 Subtract 56 from each side. x = 124 Answer: So, the value of x is 124. Example 3
ALGEBRA Find the value of x. C. 60 D. 80 Example 3 CYP