Naming Sides and Angles, and Congruent Triangles
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Grades 7–8 Math · Teaching handout
Naming Sides and Angles, and Congruent Triangles
Teaches naming the sides and angles of a triangle by their letters, the side opposite an angle, and telling whether two triangles are congruent by SSS, SAS, ASA, or RHS.
Print handout
Your first print is free, with no sign-in. Then 10 sheets a month with a free account. Prints on Letter paper, or print on A4.
Print the answer key for Try it together
- Grades
- Grades 7 and 8
- Pages
- 1
- Time
- About 15 minutes
- Answer key
- Included, for Try it together
- Printing
- Tinted accents, also fine in black and white
What is on a handout
- The big idea: the rule, in a few short sentences.
- Watch me: worked examples, each with why it changes as it does.
- Watch out: the mistakes children often make, struck through beside the right answer.
- Try it together: a few items or problems to do as a class, with an answer key.
- On your own: the practice sheet that comes next.
How to teach with it
- Have children mark equal sides with ticks and equal angles with arcs, then read the marks in order around the triangle: side, angle, side is SAS. Three equal angles alone give the same shape, not always the same size.
- Read the big idea aloud, then work through Watch me together, saying why each one changes.
- Ask the class to find the mistake in each Watch out before you show the answer.
- Do Try it together as a class, check it with the answer key, then hand out the practice sheet.
Practice worksheets
After the handout, in this order: the main practice sheet first, then more practice, then quick checks.
