The shortest side of a triangle is opposite the smallest ... This is the only combination of angles that is possible. All right-angled isosceles triangles will have these same angles.

Even though a rectangle has four equal angles, it does not have sides that are all equal length. Use your knowledge about isosceles triangles. An isosceles triangle has 2 sides of equal length.

and equal sides. You'll be using Sketch 1 of this file which has three different types of triangles - scalene, isosceles, equilateral. Each triangle type has a different colour (pink for scalene, red ...