This one’s a right angled triangle, where one angle is always a right angle, so that's 90 degrees. All triangles have internal angles that add up to 180°, no matter the type of triangle.

That means an angle cannot be greater than 360 degrees. Half of a full rotation is 180 degrees. This is represented as a straight line. One quarter of a rotation is 90 degrees. Another word for ...

Image caption, ...and draw another diagonal line to join the points and mark the angles inside the triangle. Use the scissors to cut the triangle out. STEP 4: Place two of the triangles along the ...