4. Triangles & Congruence

4.01 Angles of triangles

4.02 Review: Identifying congruent triangles

4.03 Proving triangles congruent

4.04 Corresponding parts of congruent triangles

4.05 Isosceles and equilateral triangles

4.06 Coordinate methods and triangle congruence

4.08 Justifying constructions using congruent triangles

United States of America NC

Math 2

4.05 Isosceles and equilateral triangles

Interactive practice questions

Consider the following triangle in the figure:

A triangle is shown with all three sides labeled as $14$ units in length. Each of the three internal angles of the triangle is marked as 60 degrees.

Classify the triangle. Select the three correct options.

Isosceles

A

Acute

B

Scalene

C

Equilateral

D

Easy

< 1min

Consider the diagram below.

Easy

< 1min

Consider the diagram below.

Easy

< 1min

Consider the diagram below.

Easy

< 1min

Outcomes

NC.M2.G-CO.10

Prove theorems about triangles and use them to prove relationships in geometric figures including: • the sum of the measures of the interior angles of a triangle is 180º. • An exterior angle of a triangle is equal to the sum of its remote interior angles. • The base angles of an isosceles triangle are congruent. • The segment joining the midpoints of two sides of a triangle is parallel to the third side and half the length.

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