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Classification of Triangles

Author:davide_ceoldo

A triangle with three sides of equal length could be:

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

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

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

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Is this triangle isosceles?

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

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

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

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

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

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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.

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

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