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Common Core Standard: 8.G.B.8 8th Grade Math
For horizontal or vertical lines, the length can be obtained by counting.
To find the distance from A to B count from -4 to 1 which equals 5 units
To find the distance from P to Q count from 3 to -3 which equals 6 units
Questions answered with this video..
How can you use the Pythagorean Theorem to find distance?
How do you find the distance of a vertical line on graph?
How do you find the distance of a horizntal line on a graph?
If a right triangle has leg lengths of 6 and 8 units,how do you find the length of the hypotenuse?
Questions answered in this video..
What is the distance between the ordered pairs (-4,5) and (4,2)?
What is the distance formula?
Which number do you use for x and which number do you use for y ?
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If you have trouble remembering the distance formula then you can find the distance using the Pythagorean Theorem.
A
(-3,0)
(1,3)
B
Count to the left 4 spaces for A and up 3 spaces for B
distance from A to B
distance from A to B
A
(-3,0)
B
(1,3)
d=
What is the distance from A to B?
Using the ordered pairs:
(-3,0) and (1,3)
Distance Formula =
Unfortunately, this counting approach does NOT work for
a diagonal segment.
To find the distance between two points on a Cartesian coordinate plane, use the coordinates of these ordered pairs, and the Distance formula below.
In Coordinate Geometry, there are many methods to find distances of line segments.
Let's examine some of the methods: