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IB DP Maths: AI HL复习笔记3.8.2 Shortest Distances with Lines
Category:
IB课程
,
教材笔记
,
福利干货
Date: 2022年7月20日 下午5:52
Shortest Distance Between a Point and a Line
How do I find the shortest distance from a point to a line?
The shortest distance from any point to a line will always be the
perpendicular
distance
Note that the
shortest distance between the point and the line is sometimes referred to as the
length of the perpendicular
How do we use the vector product to find the shortest distance from a point
to a line?
The vector product can be used to find the shortest distance from any point to a line on a 2-dimensional plane
Exam Tip
Column vectors can be easier and clearer to work with when dealing with scalar products.
Worked Example
Shortest Distance Between Two Lines
How do we find the shortest distance between two parallel lines?
Two
parallel
lines will never intersect
The shortest distance between two
parallel lines
will be the
perpendicular distance
between them
How do we find the shortest distance from a given point on a line to another line?
The shortest distance from any point on a line to another line will be the
perpendicular
distance from the point to the line
If the angle between the two lines is known or can be found then right-angled trigonometry can be used to find the perpendicular distance
Alternatively, the equation of the line can be used to find a general coordinate and the steps above can be followed to find the shortest distance
How
do we find the shortest distance between two skew lines
?
Two
skew
lines are not parallel but will never intersect
The shortest distance between two
skew lines
will be perpendicular to
both
of the lines
This will be at the point where the two lines pass each other with the perpendicular distance where the point of intersection would be
The
vector product
of the two direction vectors can be used to find a vector in the direction of the shortest distance
The shortest distance will be a vector
parallel
to the vector product
Exam Tip
Exam questions will often ask for the shortest, or minimum, distance within vector questions
If you’re unsure start by sketching a quick diagram
Sometimes calculus can be used, however vector methods are usually required
Worked Example
转载自savemyexams
Previous post: IB DP Maths: AI HL复习笔记3.8.1 Vector Equations of Lines
Next post: IB DP Maths: AI HL复习笔记3.9.1 Kinematics with Vectors
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