no, it is impossible
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MYou just described an equilateral triangle which is in fact isosceles and acute, and additional any isosceles triangle with a vertex angle of less than 90 is acute as the base angles are congruent and all three angles must add to180
no, it just has 2 acute angles, and one right angle.
It can't, simply because there is no such thing as an acute side.An acute angle is less than 90°. An acute triangle has each of its three angles acute.An equilateral triangle is just one special case of an acute triangle.
-- Just go ahead and draw a triangle. Any triangle.-- Did you do it ? Good.-- Your triangle has three angles in it.
Just draw it out. Draw a square with a 3-4-5 right triangle abutting it, laying on its long side with it's short side against the square. The length of the base of the triangle should be about half the length of the square's side. Trace the perimeter of these two objects, and you will get a 5 sided object with: three right edges of a square, with an obtuse angle coming off the side and an acute, reflex angle at the tip of the right triangle.