To find the circumradius of an isosceles triangle, the formula is:
1/8[(a^2/h)+4h]
in which h is the height of the triangle and a is the base of the triangle.
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The circumradius of a right angled triangle would be equal to half the length of its hypotenuse.
isosceles triangle
Are isosceles triangle sometimes an equilateral triangle
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.