Finding a Missing Angle in a Triangle Worksheet Download
Free 6th Grade math worksheets on Finding a Missing Angle in a Triangle. Each worksheet has 6 problems with an answer key and are ideal for teachers and homeschooling. You can download the PDF, create a set of flash cards or set it up for online learning.
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About this worksheet
Each worksheet has 6 problems finding the third angle of a triangle from the other two.
This standard had one worksheet and it does not ask this. That one gives two equal angles and one measure and asks for a true statement about the sum of two of them - a good reasoning question, and deliberately not the plain one. The plain form, two angles given and the third wanted, is what every textbook opens with and it was missing from the site entirely. Each triangle is drawn to the angles it describes, with both directions scaled by the same factor, so a student who checks the drawing against the numbers is not punished for checking. Every angle sits between 40 and 100 degrees, which is what keeps a corner wide enough to hold its own label. Sheets can be customized, turned into flash cards, or assigned for online learning.
Student objectives
- Add the two known angles of a triangle.
- Subtract from 180 to find the third.
- Check the answer against the drawing.
Everyday practice
- Say what the three angles of any triangle add to.
- Estimate a missing angle before working it out.
- Check whether an answer looks right in the picture.