do you want to know the area in a isosceles triangle or what?
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by the formula of ---A*b
There is no simple formula and, in any case, the answer will depend on what information about the trapezoid is given.
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.
For all triangles: area = 1/2 * base * height
The hypotenuse of an isosceles right triangle is 13 centimeters long. How long are its sides?