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Classification of Triangles

Triangles - Classification By Angles


If A=45,B=35 \angle A = 45 ^\circ, \angle B = 35 ^\circ and C=100\angle C = 100 ^\circ in the above triangle, what type of triangle is ABC? \triangle ABC?

If ABCDEFGHABCDEFGH is a cube with side length 5, 5, what is DEG? \angle DEG ?

The length of AB \overline {AB} is the same as that of AC \overline {AC} in the above triangle. If B=74, \angle B =74^\circ, what is C? \angle C ?

Suppose that A=80,B=55 \angle A = 80 ^\circ, \angle B = 55 ^\circ and C=45.\angle C = 45 ^\circ . If points D,E D, E and FF are the midpoints of BC,CA\overline{BC}, \overline{CA} and AB,\overline{AB}, respectively, what type of triangle is DEF? \triangle DEF ?

Note: The above diagram is not drawn to scale.

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


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