12. Triangles & Congruence

12.01 Angles of triangles

12.02 Review: Identifying congruent triangles

12.03 Proving triangles congruent

12.04 Corresponding parts of congruent triangles

12.05 Isosceles and equilateral triangles

12.06 Justifying constructions using congruent triangles

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Math 1

12.05 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

G.CO.10

Prove and apply theorems about triangles. Theorems include but are not restricted to the following: measures of interior angles of a triangle sum to 180°; base angles of isosceles triangles are congruent; the segment joining midpoints of two sides of a triangle is parallel to the third side and half the length; the medians of a triangle meet at a point.

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