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From the figure line AB is passing through both the axis X-axis and Y-axis. The line AB forms a triangle with the \[x\]- axis and the \[y\]– axis as it intersects both the axis at two points.

We can clearly see that in the formed triangle, the angle between the X-axis and the Y-axis is \[90^\circ \].

We know that the sum of all the interior angles of a triangle is \[180^\circ \].

Hence the sum of the remaining two angles of the triangle will be equal to \[90^\circ \].

From the figure, we can see that two sides of the triangle formed are congruent i.e. those sides are equal. Therefore, by the concept of the congruent, the opposite angles to these sides will be equal and the sum of those angles is equal to \[90^\circ \].

Hence the value of both the angles will be \[45^\circ \].

We know that the inclination of a line AB is the angle it makes with the \[x\]- axis which is equal to \[45^\circ \].

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