Do you know your angles for triangles?

This morning in maths we investigated the angles of triangles.

• Firstly I drew an equilateral triangle
• I cut out the triangle
•  I cut all the corners off
• Then put each of the cut corners into a straight line

• After I drew a second triangle which was a isosceles triangle
• I cut out the isosceles triangle
• Then cut off the corners
• I put the cut-off corners into a straight line

I learned that 3 angles of a triangle equals up to 180 degrees.