What is the distance between (23,43)(23,43) and (34,38)(34,38)?

2 Answers
Jul 10, 2018

See a solution process below:

Explanation:

The formula for calculating the distance between two points is:

d = sqrt((color(red)(x_2) - color(blue)(x_1))^2 + (color(red)(y_2) - color(blue)(y_1))^2)d=(x2x1)2+(y2y1)2

Substituting the values from the points in the problem gives:

d = sqrt((color(red)(34) - color(blue)(23))^2 + (color(red)(38) - color(blue)(43))^2)d=(3423)2+(3843)2

d = sqrt(11^2 + (-5)^2)d=112+(5)2

d = sqrt(121 + 25)d=121+25

d = sqrt(146)d=146

Or, approximately:

d ~= 12.083d12.083

Jul 11, 2018

~~12.0812.08

Explanation:

The key realization is that we can use the distance formula

sqrt((Deltax)^2+(Deltay)^2)

Where the Greek letter Delta means "change in". We just need to figure out how much our x and y change by, respectively.

We go from x=23 to x=34, so we can say Deltax=11.

We go from y=43 to y=38, so we can say Deltax=-5.

Plugging these into our formula, we get

sqrt((11)^2+(-5)^2)

=>sqrt(121+25)=sqrt(146)~~12.08

Hope this helps!