A worksheet on the following triangle and parallel lines theorems:The line segment joining the mid - points of any two sides of a triangle is parallel to the third side and equal to half of it.The median to the hypotenuse of a right triangle is equal to half of the hypotenuseIn a right triangle the side opposite the 30 degree angle is half the length of the hypotenuse.If three or more parallel lines cut off congruent segments on one transversal, then they cut off congruent segments on every tran