I learned about isosceles triangles in school last Thursday.
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isosceles triangle
Are isosceles triangle sometimes an equilateral triangle
You will also need the angles so that you can use the Isosceles Triangle Theorems to solve for the base of isosceles triangle when only two sides are given.
An obtuse triangle is not necessarily isosceles, but it can be.
No. An isosceles right triangle is a special case. There are many right triangles which are not isosceles.