I am a tool used to draw neck and armhole easier. i have two words for my name. what am i ?

Measuring tape

Explanation:

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first you need to pick out the favorite to the less favorite and have your pictures in a protector clear plastic then place your pics in the binder

explanation:

coordinates of r(b,c)

slope of nm is 0.

step-by-step explanation:

the midpoint of the line joining the points (x₁,y₁) and (x₂,y₂) is given by

the midpoint of the line segment nk is given by

∴r(b,c)

the slope of the line joining the points (x₁,y₁) and (x₂,y₂) is given by

slope of rs is

hence

coordinates of r(b,c)

and slope of nm is 0.