An isosceles triange has 2 equal sides and 2 equal interior angles whereas an acute triangle has 3 unequal sides and 3 interior acute angles of different sizes
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If it has 2 equal acute angles and 1 obtuse angle then it is an isosceles triangle.
It can be but does not have to be.
Only when it has 2 equal acute angles and 1 obtuse angle that it is an isosceles triangle
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.
An Isosceles triangle has 2 or 3 acute angles.