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7th Grade Math (Math 7) · Chapter 8 · Lesson 8.6 · Printable PDF

Parts of a Triangle Worksheet with Answer Key

7 problems on parts of a triangle: sides opposite and angles included, isosceles triangles, a tabletop cut in two, a shelf bracket's pieces, a pennant, and why a claim about right triangles is wrong. 3 pages, with a worked answer key.

7 problems3 pagesanswer key
Printable Parts of a triangle worksheet with answer key - 7th Grade Math (Math 7) (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. Name the sides and angles of a sail triangle by filling in blanks.
  2. In isosceles riangle PQR, name the equal sides, base and angles, and find the perimeter.
  3. Find x and the three angles of riangle RST, then name a side.
  4. Name the two triangles made by sawing a tabletop and their sides and angles.
  5. Find the right angle and the legs of a shelf bracket triangle.
  6. Find x and DF for isosceles pennant riangle DEF, and name its parts.
  7. Explain why Lily's claim about the hypotenuse is wrong.

Teach it first

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

Parts of a triangle: the lesson ›

More Chapter 8 worksheets: Angles, triangles and constructions