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Answer:
X=100°
Step-by-step explanation:
The following figure can be taken as a quadrilateral ABCD where
AB = BC
CD = DA = BD
angle B =25°+25° = 50° [angles of the isosceles triangle measure the same]
Angle A= Angle D = 25° [angles opposite to the equal sides are also equal]
Angle A+ B + C + D= 360°( angle sum property)
=25+50+x+25=360
=100+C=360
C=360-100=260°
C+ X=360°
260+x=360
X=360-260=100°
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