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Geometry · Chapter 4 · Lesson 4.7 · Printable PDF

Isosceles and Equilateral Triangles Worksheet with Answer Key

6 problems on isosceles and equilateral triangles: the Base Angles Theorem and its converse, finding angles from a given ratio, radii of a circle, roof rafters, and a proof. 2 pages, with a worked answer key.

6 problems2 pagesanswer key
Printable Isosceles and equilateral triangles worksheet with answer key - Geometry (Page 1 PDF preview)
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Try one first: a free Chapter 1 worksheet (PDF, no sign-in).

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What's on the worksheet

  1. Use the distance formula to find sides of a triangle, then name its base and vertex angle.
  2. Find every set of angles of an isosceles triangle with one angle 4 times another.
  3. Find angles of a triangle from radii drawn to a circle.
  4. Find angles in a roof with equal rafters and a collar tie.
  5. Decide if each statement about triangle ABC is true for every triangle and name the result.
  6. Prove a segment fact in an isosceles triangle with equal segments on its base.

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The free lesson teaches it with worked examples and practice problems.

Isosceles and equilateral triangles: the lesson ›

More Chapter 4 worksheets: Triangle congruence and proof