Download 1.4 All About Angles

GEOMETRY
1.4 It’s All About Angles
1.4 Translating and Constructing
Angles and Angle Bisectors

Objectives
 Translate
an angle on the coordinate plane
 Copy or duplicate an angle by construction
 Bisect an angle by construction

Needs
 Ruler
(Straightedge)
 Compass
 Protractor
 Patty Paper
Problem 1: Translating an Angle


Together 1 and 2
Angle
 Formed
by two rays or segments
 Share a common endpoint
 Has two sides and a vertex
 Symbol ∠ 𝑜𝑟 ∡

Naming an Angle
 Must
put the vertex in the middle
 Pick a point on a side, Name the vertex, Pick a point on
the other side
Problem 1: Translating an Angle

Collaborate 3 (8 Minutes)
Problem 1: Translating an Angle
Problem 1: Translating an Angle

Together 4-9
CONSTRUCTIONS




Problem 2: Constructing an Angle
Use only a straightedge and a compass
Together Demo
Together 1-2
CONSTRUCTIONS





Problem 3: Bisecting an Angle
Use only a straightedge and a compass
Demo Together with Patty Paper
Bisect Demo Together
Together 1-5
Formative Assessment

Talk the Talk (pg. 60)
 We

will discuss the solutions tomorrow to start class
Skills Practice 1.4
 Skip
Vocabulary
 Constructions 8 and 14 (Do these first)
 Problems Pg. 296-297 (1-6)

Turn in construction tools to the front on the way out.
Each tool has a tray.