When two lines are cut by a transversal and their alternate interior angles are equal, then the lines are

perpendicular

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parallel

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inclined at 120 degrees

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inclined at 60 degrees

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Which of the following statements are true (I) and which are false (F)? Give reasons.
(i) If two lines are intersected by a transversal, then corresponding angles are equal.
(ii) If two parallel lines are intersected by a transversal, then alternate interior angles are equal.
(iii) Two lines perpendicular to the same line are perpendicular to each other.
(iv) Two lines parallel to the same line are parallel to each other.
(v) If two parallel lines are intersected by a transversal, then the interior angles on the same side of the transversal are equal.

Q. If A and B are alternate interior angles when a transversal intersects two parallel lines and A = 78 degrees, then B = ___ degrees.

When two lines are cut by a transversal and their alternate interior angles are equal, then the lines are

If two parallel lines are intersected by a transversal, then interior angles on the same side of the transversal are _______(in degrees).

When a transversal cuts two lines such that pairs of alternate interior angles are ___, then the lines have to be parallel.

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