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Compare it to a very fine plumb line. Construct your line with a Peaucellier-Lipkin Linkage (see link below). Examine the line with a laser device.

Q: How can you know if a line is straight without using a ruler?

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You know the exact measurement of something, wether it is Cenemiters or Inches... You can draw a straight line with the ruler as your guide line... And it's a GREAT object to smack people with!!!

well, i don't know why they exactly are straight but i think that they are made on a plate boundary which is also a fairly straight line. so i don't know if it is right but try

If you know one side (s) and the opposite angle (a) then the hypotenuse = s/sin a...

answr the question39mm beats the answer above dont know if its right3.0CM ;)

the sum of the angles of a plane triangle is always 180° In an equilateral triangle, each of the angles is = Therefore, the angles of an equilateral triangle are 60°

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You know the exact measurement of something, wether it is Cenemiters or Inches... You can draw a straight line with the ruler as your guide line... And it's a GREAT object to smack people with!!!

To measure distance and to draw straight lines

to be a good teacher you need to be able to teach without using a book they should know the book instead of teaching straight out of a book

A scale, a stopwatch and a ruler. Weigh the object of which you want to know the momentum, and determine its speed using the stopwatch and ruler. The momentum can then be calculated as the product of the weight and the speed.

you can do that by using a ruler and if you don't how to use it well i really don't know ok that's all i cam answer

i dnt know

You know the size of a monitor by using a ruler to measure the screen diagonally. This applies to both older style CRT monitors and new LCD monitors.

By using a ruler or doing a perdiction.And a chance of measering it on the corners of the wall.So you know what height you have everyday and in 24 hrs.

You can use a curling iron, put the gel/chemicals in it, or just keep brushing it through until its not as curly anymore. With having curly hair, i know these work, but it may work better with just using a flat iron.

You would know if you are pregnant without using a pregnancy test by checking the vagina,and sticking your finger up through your vagina,and then If it tastes like cheese,you are pregnant.

ruler, yardstick, or meterstickA ruler or measuring tape ... mind you you can use anything as a tool to measure .... so long as you know the length of the tool you are using ...

i dont know