Page 45 - Math Course 2 (Book 2)

Quadrilaterals
Mo. 8

Lesson 2

KEY CONCEPTS:
1. I Find the missing angle measures of a One pair of opposite Two pairs of
quadrilateral. sides are parallel base parallel sides
2. Classify quadrilaterals. and angle are equal

MO. 8 - L2a
Four right all four side
Classifying Quadrilaterals angles are of equal
length

Vocabulary A-Z Key Concept

Let us learn some vocabulary

Angles of a Quadrilateral

quadrilateral The sum of the measures of the angles of a
A quadrilateral is a closed figure with four sides quadrilateral is 360°
and four vertices.

Let’s Begin

Find Angle Measures

No sides are Two sides are Example
parallel parallel

ALGEBRA
Find the value of x. Then find each missing angle
measure.
R S
4x° 110°
The sum of the
Two pairs of Four sides are measures of the
adjacent sides are of equal length angles is 360°. 75° x°
of equal length
Q T

Let m∠Q, m∠R, m∠S, and m∠T represent the
measures of the angles.

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