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As there are two sides equal in an isosceles triangle,they both have two add up to
90 degree.One is 45 degree while the other one is 45 degree too.So as it has a right angle,it has one angle as 90 degree.45+45=90+90=180.So the sum of an right angled isosceles triangle is 180 degree.
The sum of all three interior angles of any triangle, isosceles or not, is 180 degrees.
A triangle that has one right angle and is isosceles is called an isosceles right triangle.
An isosceles triangle can have a 90 degree angle, but doesn't necessarily. Similarly, a right triangle can be an isosceles triangle, but isn't necessarily.
No.
An isosceles obtuse triangle is a triangle with 1 obtuse angle and only 2 congruent sides.