18. Find the values of the unknowns x, y, z.
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if it is a parrellelogram, then the opposite sides are equal. So y= 100°, then the total sum of interior angles of a parrellelogram is 360°. So 360° - 200° = 160°. NOW let x and z be a, so 2a = 160° then solve it the answer will be 80° each. so x= 80° and z = 80°. or you can simply write 100°+100°+a+a=360°. I hope that helps you.
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