X=13
y + 98 =180(LP)
Y =180-98
Y=82
<AOB + <OAB + <OBA=180(Sum of all angles of triangles)
85 + X + 82 =180
167 + X =180
X = 180-167
X=13
In Euclidean geometry, any three points that are not collinear produce a singular triangle and a singular plane (i.e. a two-dimensional Euclidean space). In other words, every triangle is contained in a plane, and there is only one plane that contains that triangle. All triangles are enclosed in a single plane if all of the geometry is the Euclidean plane, however, this is no longer true in higher-dimensional Euclidean spaces.
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