**90 o ). For both triangles, two sides and the included angle are congruent. Another situation where you can work out isosceles triangle area, is when you know the length of the 2 equal sides, and the size of the angle between them. The difference between these two definitions is that the modern version makes equilateral triangles (with three equal sides) a special case of isosceles triangles. When you are estimating the size of an angle, you should consider what type of angle it is first. An isosceles triangle is a triangle with two sides of equal length, which are called legs. Finding angles in isosceles triangles Our mission is to provide a free, world-class education to anyone, anywhere. I believe it takes either 3 points to define a triangle, or 2 points and an angle, allowing the third point's co-ordinates to be calculated using trigonometry. The hypotenuse length for a=1 is called Pythagoras's constant. 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