Given data:
The first given side is BE = 7.
The second given side is FC = 2.
The third given side is ED = 5.
The first given triangle ABE is right angle triangle and scalene triangle.
The triangle DEF is an acute angle triangle which is an equilateral tiangle.
The triangle BEC is an acute angle and isosceles triangle.
The triangle CDF is an obtuse angle triangle which is scalene triangle.