JK JK\,JK and LM LM\,LM are parallel lines. XYZ XYZ\,XYZ is an isosceles triangle where X X\,X and Y Y\,Y lie on the line JKJKJK, and Z Z\,Z lies on the line LMLMLM. Angle WXZ=115∘WXZ = 115^\circWXZ=115∘ where W W\,W is a point on the line JKJKJK.
Find the size of angle YZMYZMYZM.
Give a reason for each stage of your working.