Sorry, there is no such thing as a rectangular triangle.
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An isosceles triangle has 3 sides 2 of which are equal in length
The step to verify an isosceles triangle is: 1) Find the intersection points of the lines. 2) Find the distance for each intersection points. 3) If 2 of the distance are the same then it is an isosceles triangle.
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.
If a triangle is an isosceles triangle as well as being a right-angled triangle, the size of the two angles (that are not right angles) are 45 degrees.
An isosceles triangle has 2 equal base angles and its height is perpendicular from its apex to the centre of its base