# Higher Maths - Straight Line

How can you tell if two lines are parallel?
They have equal gradients
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What are collinear points?
Points that lie on the same straight line
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How can you tell if points are collinear?
If two lines are parallel AND share a common point
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What do you need to write to communicate your findings in a collinearity question?
1. the two gradients that are equal to each other (e.g Mab = Mbc) 2. therefore which lines are parallel 3. The common point 4. All points that are collinear 5. Refer back to question if necessary
4 of 10
Any two lines which meet each other at 90° are...
Perpendicular
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How do you find the perpendicular gradient of another gradient?
Divide it by -1 (i.e if m=8 then m⊥= 8÷-1 = -1/8) OR swap the numerator and denominator and then multiply by -1 (i.e m=4/3 m⊥=-3/4)
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If you see the words "positive direction of x-axis" what relationship will you use?
m = tanθ
7 of 10
A median is a...
Line drawn from a vertex to the midpoint of the opposite side
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A line drawn from a vertex which is perpendicular to the opposite side is an...
Altitude
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What is a perpendicular bisector?
A line that cuts another line in half at a right angle
10 of 10

## Other cards in this set

### Card 2

#### Front

What are collinear points?

#### Back

Points that lie on the same straight line

### Card 3

#### Front

How can you tell if points are collinear?

#### Back ### Card 4

#### Front

What do you need to write to communicate your findings in a collinearity question?

#### Back ### Card 5

#### Front

Any two lines which meet each other at 90° are...

#### Back 