101 degrees :p
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If it has 2 equal acute angles and 1 obtuse angle then it is an isosceles triangle.
Yes an isosceles triangle can have two equal acute base angles of 40 degrees and an apex angle of 100 degrees
No, an isosceles triangle can not be a right triangle, because a right triangle has an angle of 90 degrees angle, and two angles of 45 degrees. An isosceles triangle has all acute angles, therefor, making it an acute triangle, so no, an isosceles triangle is not, i repeat not, a right triangle.
A right angle isosceles triangle is then formed which will have two 45 degrees angles and one 90 degrees angle.
They both have 3 sides but an isosceles triangle has two equal sides whereas an acute triangle with different acute angles has no equal sides and is said to be a scalene triangle, or an acute triangle with three equal acute angles (of 60° each) and three equal sides is called an equilateral triangle.