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Geometry
February 1, 2017
6.1-3 QUIZ
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1.
Solve for x: 7x + 25 + 2x + 65 = 180
2.
Solve for x: 4x + 45 + 70 + 25 = 540
3.
What is the measure of an exterior angle of a regular
octagon?
4.
Four of the exterior angles of a pentagon measure 70
degrees each. What is the measure of the fifth angle?
Today’s Objectives
1. Review Polygon Angle Sum Theorem and
Exterior Angle Sum Theorem and basic
properties of parallelograms
2. QUIZ
Review: Polygon Angle Sum Theorem
The sum of the interior angles:
𝑛 − 2 ⋅ 180°
Each interior angle of a regular polygon:
𝑛 − 2 ⋅ 180°
𝑛
Review: Exterior Angle Sum Theorem
The sum of the exterior angles:
360°
Each exterior angle of a regular polygon:
360°
𝑛
Review: Parallelogram
Definition: A quadrilateral with two pairs of
parallel sides.
Properties 1-3
Properties 4-5