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Worksheets for classifying triangles by sides, angles, or both

Find here an unlimited supply worksheets for classifying triangles by their sides, angles, or both — one of the focus areas of 5th grade geometry. The worksheet are available in both PDF and html formats.

You can control the number of problems, workspace, border around the problems, image size, and additional instructions. Otherwise, it is pretty simple.

Basic instructions for the worksheets

Each worksheet is randomly generated and thus unique. The answer key is automatically generated and is placed on the second page of the file.

You can generate the worksheets either in html or PDF format — both are easy to print. To get the PDF worksheet, simply push the button titled "Create PDF" or "Make PDF worksheet". To get the worksheet in html format, push the button "View in browser" or "Make html worksheet". This has the advantage that you can save the worksheet directly from your browser (choose File → Save) and then edit it in Word or other word processing program.

Sometimes the generated worksheet is not exactly what you want. Just try again! To get a different worksheet using the same options:

  • PDF format: come back to this page and push the button again.
  • Html format: simply refresh the worksheet page in your browser window.

Below you'll find some ready-made worksheets (typically for grade 5 math).

Classify triangles by their sides

View in browser     Create PDF

Classify triangles by their angles

View in browser     Create PDF

Classify triangles by sides and angles

View in browser     Create PDF

Classify triangles by sides and angles
(to print in landscape)

View in browser     Create PDF

Classify Triangles Worksheet Generator

Choose one of the problem types below.
Classify triangles by their sides only (equilateral, isosceles, scalene)
Classify triangles by their angles only (acute, obtuse, right)
Classify triangles by their sides and angles
(7 different types, such as acute isosceles, obtuse scalene, right isosceles, etc.)

Size of images:
Columns:   Rows:
(These determine the number of problems)

Number of empty lines below the problem (workspace)
Page orientation:
Portrait   Landscape
(PDF worksheet only; the orientation of an html worksheet can be set in the print preview of the browser)

Font:   Font Size: 

Cell Padding:     Border:  

Additional title & instructions  (HTML allowed)


Key to Geometry workbook series

Key to Geometry Workbooks

Here is a non-intimidating way to prepare students for formal geometry. Key to Geometry workbooks introduce students to a wide range of geometric discoveries as they do step-by-step constructions. Using only a pencil, compass, and straightedge, students begin by drawing lines, bisecting angles, and reproducing segments. Later they do sophisticated constructions involving over a dozen steps-and are prompted to form their own generalizations. When they finish, students will have been introduced to 134 geometric terms and will be ready to tackle formal proofs.

=> Learn more