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Unit 7 – Angles and Triangle Essential Vocabulary
NDC_________________________
VOCABULARY REVIEW ACTIVITY
Pre-Cut the strips and place the vocabulary words in a ziploc bag and the
definitions in a separate bag. If you use a different color of paper for each of
the sets, they are easy to sort if they get mixed between groups during the
investigation. Be sure to make copies of the “VOCABULARY NOTE SHEET ” to
handout to students in part 3.
PART 1: Word Sort:
1. Hand out the baggies with the words only (hold back the definitions). Have
students complete an open sort with no categories given. Students must
identify a label/name for the categories.
2. Allow students to share their categories and reasoning.
PART 2: Definition Match Predictions
1. Hand students the baggies with the definitions and ask them as a group to
decide how to match the words and definitions.
2. Check in with groups to make sure they have correct matches. Once
students have matched, handout the VOCABULARY NOTE SHEET for
students to transfer their answers onto the notes.
PART 3: Whole group review
1. During this time, go over the notes as a class asking students to add some
facts and/or picture representations to complete the sheet.
Unit 7 – Angles and Triangle Essential Vocabulary
NDC_________________________
Term
Definition
Acute Angle
an angle whose measure is less
than 900
Obtuse Angle
an angle whose measure is
greater than 900 and less than
1800
Straight Angle
an angle whose measure is
exactly 1800
Right Angle
an angle whose measure is
exactly 900
Acute Triangle
a triangle with all three
angles measuring less than 900
Obtuse Triangle
a triangle that has one obtuse
angle
Right Triangle
a triangle that has one right
angle
Complementary
Angles
two angles whose measures
total 900
Supplementary
Angles
Two angles whose measures
total 1800
Vertical Angles
angles formed when two lines
intersect, these angles are
opposite one another and have
equal measures
Triangle
a closed polygon with three
sides
Example
Unit 7 – Angles and Triangle Essential Vocabulary
NDC_________________________
Scalene
Triangle
a triangle with no congruent
sides
Isosceles
Triangle
a triangle with two congruent
sides
Equilateral
Triangle
a triangle with three congruent
sides
Ray
a part of a line with exactly one
endpoint
Angle
a figure formed by two rays that
share a common endpoint
Line
A series of points that extends in
opposite directions without end
Line Segment
Part of a line with two
endpoints
Vertex
the point where two or more
lines intersect, or where two
sides of a polygon intersect, or
the point of intersection for two
rays
Adjacent
Angles
Angles that share a vertex and a
side but no points in their
interiors (side by side)
Unit 7 – Angles and Triangle Essential Vocabulary
NDC_________________________