Geometry
4.1, 4.2, 4.6 Study Guide
(+Chapter 1)
1. Be able to define each type of triangle:
 Equiangular Triangle
 Right Triangle
 Obtuse Triangle
 Acute Triangle
Name
Date



Hour
Equilateral Triangle
Isosceles Triangle
Scalene Triangle
2. Know that the interior angles of a triangle add up to 180.
 Be able to find the measure of a missing angle.
 Be able to find the measure of a missing angle by setting up and solving an equation.
3. Know that the Exterior Angle Theorem states that the measure of an exterior angle of a triangle
is equal to the two non-adjacent interior angles of the triangle.
 Be able to find the measure of a missing angle given two of the three angle measures and Be
able to find the measure of a missing angle by setting up and solving an equation using the
exterior angle theorem.
4. Know that in an Isosceles Triangle two sides are congruent and the two base angles (opposite
the congruent sides) are congruent.
 Be able to solve for a missing angle measure (use the fact that all interior angles add to
180).
 Be able to solve for a missing side length (use the fact that congruent sides have equal
length).
 Be able to solve for a variable by setting up equations involving congruent side lengths
and/or congruent angles.
5. Know that in an Equilateral Triangle has all three sides are congruent and the all angles are
congruent (they’re each 60).
 Be able to solve for a variable by setting up equations involving congruent side lengths
and/or congruent angles (60).
6. Be able to write congruence statements for triangles.
 Be able to identify/write congruence statements for the triangle in three different ways.
 Be able to identify/write congruence statements for angles.
 Be able to identify/write congruence statements for each side/segment
7. Given congruent triangles, use congruence statements to identify congruent
parts and solve for measures/variables.
Chapter 1 Review
1. Use the segment addition postulate to solve for segment lengths.
2. Use the definition of midpoint to set up equations and solve for missing values/measures.
3. Use the vertical angle theorem to set up equations and solve for missing values/measures.
Geometry
Name
4.1, 4.2, 4.6 Flash Cards
Date
Hour
Use your notes/book to create flashcards on this list to study for the quiz.
For the Triangle Types, make two cards for each.
One for the definition, one for a drawing. Use your notes/book!
Equiangular Triangle
Right Triangle
Obtuse Triangle
Acute Triangle
Equilateral Triangle
Definition
Drawing
Isosceles Triangle
Scalene Triangle
Triangle Angle Sum Theorem
The sum of the measures of the interior angles of a triangle
is _______.
mA + mB + mC = ________
Exterior Angle Theorem
2
3
The measure of an exterior angle of a triangle is equal to
the sum of the measures of the two __________________
___________________ angles.
m3 = _____________________
1
Congruent Figures
Naming congruent triangles
Two geometric figures are ____________ if they have
the same ____________and ____________.
Must name them in corresponding order
corresponding angles are____________
corresponding sides are ____________
Segment Addition Postulate
Vertical Angle Theorem
Definition of Midpoint
See Chapter 1 Notes & Tool Kit
See Chapter 1 Notes & Tool Kit
See Chapter 1 Notes & Tool Kit