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Isosceles Triangle Theorem Worksheet

Explore the properties of isosceles triangles, including angles and side lengths, with this Grade 6 math worksheet.

Grade 6 Math GeometryIsosceles Triangle Theorem
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Includes

TextMultiple ChoiceFill in the Blanks2 Short AnswerTrue / False

Standards

CCSS.MATH.CONTENT.6.G.A.1

Topics

mathgeometryisosceles triangleanglesgrade 6
8 sections · Free to use · Printable
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Isosceles Triangle Theorem

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Read each question carefully and answer to the best of your ability. Show all your work for full credit.

An isosceles triangle is a triangle that has at least two sides of equal length. The angles opposite these equal sides are also equal. These are called base angles.

1. Which of the following statements is true about an isosceles triangle?

a

All sides are equal.

b

All angles are 60 degrees.

c

At least two sides are equal.

d

No sides are equal.

2. In an isosceles triangle, the two angles opposite the equal sides are called the   angles.

3. If an isosceles triangle has two sides of length 7 cm, then the angles opposite those sides are  .

4. Look at the triangle below. If angle A is 70 degrees and side AB is equal to side AC, what are the measures of angle B and angle C?

ABCABAC

5. All equilateral triangles are also isosceles triangles.

T

True

F

False

6. An isosceles triangle can have three different side lengths.

T

True

F

False

7. An isosceles triangle has one angle measuring 100 degrees. What are the measures of the other two angles?