Topics
5. Relationships in Triangles
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United States of AmericaFL
Grade 912

5.01 Isosceles and equilateral triangles

Lesson
Practice
Adaptive
Worksheet

Interactive practice questions

$\triangle ABC$△ABC is isosceles, with $\overline{AC}\cong\overline{AB}$AC≅AB.

An isosceles triangle with the top vertex labeled $A$A at $\angle CAB$∠CAB. There are two base vertices which are labeled $C$C (on the left) and $B$B (on the right). The $\angle CAB$∠CAB at vertex $A$A is labeled as degrees(38).Base $\angle ABC$∠ABC at vertex $B$B is labeled as $\left(x\right)$(x) and base $\angle BCA$∠BCA at vertex $C$C is unlabeled.

 

 

 

 

Solve for $x$x.

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

MA.912.GR.1.3

Prove relationships and theorems about triangles. Solve mathematical and real-world problems involving postulates, relationships and theorems of triangles.

MA.912.LT.4.8

Construct proofs, including proofs by contradiction.

MA.912.LT.4.10

Judge the validity of arguments and give counterexamples to disprove statements.

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