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What is the difference between a straightedge and a ruler?
a straightedge need not have measuring increments (inches, centimeters, etc.) while a ruler is a straightedge with measuring increments
How do you make 40 degree angle using compass and ruler what is the maths behind it?
Using a protractor rather than a compass is easier as follows:- Draw a straight line of about 8 cm then place a protractor onto the line with zero degrees at the beginning of the line then mark off 40 degrees. Remove the protractor and join the mark to the beginning of the straight line and 'hey presto!' you have constructed a 40 degree acute angle. ---------------------------- It isn't possible to construct a 40 degree angle with only a straightedge and compass. There are well-known constructions for making a 60 degree angle and a 90 degree angle. Building on this, you can make an angle of any multiple of 15 degrees by adding and/or subtracting these angles. If you successively bisect these angles, you get angles of 30, 15, 7.5, 3.75, ... and 45, 22.5, 11.25, ... etc. degrees. Unfortunately there is no way to combine these angles to get exactly 40 degrees. If there were a way to trisect an angle, this would open up many more possibilities. For instance if you trisect a 120 degree angle, you get 40 degrees. In traditional geometrical constructions, you are only allowed to use a ruler and straightedge - a ruler with no marks on it. The Greeks made this rule several centuries BC. For at least 2500 years people have tried to find a way to trisect an angle, but no one has succeeded. If you change the word "straightedge" to "ruler", (all you really need to do is make a pencil mark on the straightedge), then there is a method, but it isn't considered a construction, and it's not really accurate because you have to juggle the position of the ruler until it fits in a certain position.
What is a straightedge?
A "straightedge" person was originally someone who didn't do any of the following; * take/use drugs * drink any alcohol * smoke * have sex * eat dairy products * eat meat now-a-days, most kids call themselves straightedge if they don't do the top 3 in the list, and any kids that don't do anything in the list are called "hardcore straight-up straightedge kids" Answer A straightedge is a piece of wood or plastic to help in drawing straight lines. A ruler is a straightedge, but a straightedge may not be a ruler. Both have a straight edge, certainly, but a ruler also has marked gradations for measuring things.
What are the 4 basic tools of geometry?
A protractor, a compass, a ruler, and a straightedge
What is the diffreference between a ruler and a straightedge?
A ruler is usually graduated so that it can be used to measure lengths. A straight edge is just that: it has no marking to help you measure lengths.
