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# Intersecting lines are perpendicular?

sometimes,always,never,not enough information

### 12 Answers

- 1 decade ago
Not always. Perpendicular means to make a 90 degree angle, so if the lines intersect and create this right angle, then they are perpendicular. If they intersect at different angles, like 20 degrees or 30 degrees or anything but 90 degrees, they're not perpendicular.

Think of perpendicular lines being like a big plus sign, and you'll get it.

- 1 decade ago
Lines can intersect at any angle greater than zero. They don't necessarily have to intersect perpendicular to each other (90 degrees). The answer is sometimes.

- CPUcateLv 61 decade ago
if there are two lines such as

y = 2x + 4 . . . . . .equation.1 . . . the slope of this line is 2

y = -1/2 x +6 . . . .equation 2 . . . the slope of equation 2 is -1/2

if the slope of one line is equal to negative reverse fraction then the two lines are perpendicular

or . . . . . . m1 = - 1 / m2

. . . . . . . 2 = - 1 / ( - 1 / 2 ) = 2

. . . . . . . . . 2 = 2 . . . the two lines are perpendicular

you try this two perpendicular lines

y = 4/5 x +2 . . . . . equation 1

y + 5/4x -8 = 0 . . . . equation 2

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- Anonymous5 years ago
✐Explanation✐ Not all the times. Think about two lines forming no right angles. If they don't form those angles, then they are not perpendicular. I hope that helps.

- 1 decade ago
perpendicular lines are always intesecting, but intersecting lines aren't always perpendicular

- gfulton57Lv 41 decade ago
Yep, sometimes. If their slope are negative reciprocals of one another, they are perpendicular.