ALL triangles - have internal angles that add up to 180 degrees.
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because an isosceles triangle or any kind of triangle is 180 degrees.
The right isosceles triangle has 180 degrees as all triangles do
Yes, but a triangle is acute only if all three of its angles are acute (< 90o).An isosceles triangle can be an acute triangle, but it doesn't have to be.An acute triangle can be an isosceles triangle, but it doesn't have to be.That depends on the sizes of its angle because an isosceles triangle has 2 equal sides and 2 equal angles which could be 70 degrees, 70 degrees and 40 degrees which are all acute angles that add up to 180 degrees.
The angles inside any triangle sum to 180 degrees. Isosceles simply means two sides are the same length.
Not normally but if it has angles of 90, 45 and 45 degrees it is then both a right angle and an isosceles triangle