Topics
7. Proof & Congruence
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United States of AmericaUT
Math II

7.07 Isosceles and equilateral triangles

Lesson
Practice

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
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Outcomes

II.G.CO.10

Prove theorems about triangles. Theorems include: 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.

II.G.SRT.5

Use congruence and similarity criteria for triangles to solve problems and to prove relationships in geometric figures.

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