Yes, actually it has to be. The only type of triangle with even sides is an equilateral triangle, but all of the angles of an equilateral are 60 degrees, because everything is equal and 180(total degrees within a triangle)/3(number of angles)=60(degrees per angle of an equilateral).
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sometimes An Isosceles Triangle has 2 equal sides and 2 equal angles. A right triangle could fit the description
Unless it is a right isosceles triangle, a normal right triangle has no pairs of equal sides.
Pick three numbers. If the square of the largest number is equal to the sum of the squares of the other two, then the three numbers could represent the sides of a right triangle.
It is the right angle triangle which has 3 sides whereas all quadrilaterals have 4 sides.