Perpendicular Lines (Junior Cert Mathematics): Flashcards

Lines that meet at a 90-degree angle

90 degrees (right angle)

L shape

$-1$

$m \times m' = -1$

Flip it and change the sign

$-\frac{1}{2}$

$\frac{1}{3}$

Lines meet at right angle, form L shape

Multiply slopes; if $-1$, lines are perpendicular