Missing angle in a triangle

Students calculate missing angles in triangles following these steps:

Children should be reminded that the sum of all angles in a triangle is always 180°.

They then add the measures of the known angles together.

Next, they subtract the sum of the known angles from 180° to find the missing angle.

For example, if you have angles of 60° and 80°, the missing angle would be 180° - (60° + 80°) = 40°.

This method applies to all types of triangles.

Includes the answer sheet.