Mathematics
Which of the following are models for perpendicular lines?
(i) The adjacent edges of a postcard.
(ii) The line segment forming the letter 'L'.
(iii) The adjacent edges of your Math book.
(iv) The line segments forming the letter 'V'.
Answer
Two lines are called perpendicular if they intersect at right angles (90°).
(i) The adjacent edges of a postcard meet at right angles.
∴ Yes, they are models for perpendicular lines.
(ii) The line segments forming the letter 'L' meet at right angles.
∴ Yes, they are models for perpendicular lines.
(iii) The adjacent edges of a Math book meet at right angles.
∴ Yes, they are models for perpendicular lines.
(iv) The line segments forming the letter 'V' meet at an acute angle, not at a right angle.
∴ No, they are not models for perpendicular lines.
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