Classification of Triangles

A triangle with three sides of equal length could be:

Two angles in a triangle measure 100° and 40°. Is the triangle isosceles?

If one of my angles measures 50°, what type of triangle could I be?

Will the three pencils with lengths of 3, 4, and 6 create an acute, right, or obtuse triangle?

Is this triangle isosceles?

What type of triangle has both an 89° angle and a 1° angle?

Two sides of an isosceles triangle measure 3 and 5. What could be the length of the third side?

Above, a line cuts across two adjacent rectangles. How many right triangles can you find in this diagram?

If , and  in the above triangle, what type of triangle is ?

The length of is the same as that of in the above triangle. If , what is ?

Suppose that , and \angle C = 45^\circ[/math]. If points , and are the midpoints of , and , respectively, what type of triangle is ? Note: The above diagram is not drawn to scale.

What do we call a triangle which has exactly 2 equal angles?