Download Section 1.4 Measure and Classify Angles

Geometry Chapter 1: Essentials of Geometry Section 1.4 – Measure and Classify Angles SWBAT: name, measure, and classify angles. Common Core: G-­‐CO Experiment with transformations in the plane 
G.CO.1. Know precise definitions of angle, circle, perpendicular line, parallel line, and line segment, based on the undefined notions of point, line, distance along a line, and distance around a circular arc. Vocabulary: angle-­‐ acute, right, obtuse, straight; sides, vertex of an angle, measure of an angle, congruent angles, angle bisector Example 1: Name angles A
a. Name the angles in the diagram C
B
D
Geometry Chapter 1: Essentials of Geometry Example 2: Measure and classify angles Geometry Chapter 1: Essentials of Geometry Example 3: Find angle measures J
a. If 𝑚∠𝐽𝐾𝑀 = 72°, 𝑓𝑖𝑛𝑑 𝑚∠𝐽𝐾𝐿 𝑎𝑛𝑑 𝑚∠𝑀𝐾𝐿. L
(3x + 6)°
M
(2x - 9)°
K
Geometry Chapter 1: Essentials of Geometry Practice: Geometry Chapter 1: Essentials of Geometry Example 4: Identify congruent angles Example 5: Double an angle measure a. In the diagram below, 𝑃𝑁 bisects ∠𝑄𝑃𝑂, and ∠𝑄𝑃𝑂 = 122°. Find 𝑚∠𝑄𝑃𝑁. O
N
Homework: pgs. 29 – 30 #’s 3 – 41 ODD Q
P