Construct a 90 degree angle isosceles triangle which will have equal sides and then divide the base into 9 equal parts joining the parts by lines to the apex of the trangle.
Each line represents 10 degrees and 8 lines will equal to 80 degrees.
You don't always need a protractor to make an angle, just use a normal ruler.
i think about 110 degrees
Lines that form a 90 degree angle at their vertex. Two lines that make a 90 degree are perpendicular.
HOW TO MAKE 40 DEGREE ANGLE USING RULER AND COMPASSStep 1:-Draw a line segment BC of any measurement.Step 2:-Now, B as center and any radius draw an arc give it as arc (RS).Step 3:-Where the arc rs cut the line segment BC give that point as P.Now, with P as center and same radius cut another arc which intersect the arc RS at point X.Step 4:-With X as center and same radius cut another arc which intersect the arc RS at point Y.Step 5:-with X as center and any radius cut an arc and now,Y as center and same radius cut another arc which intersect the first arc.Step 6:-Now taking Z as center and radius ZP cut another arc.Now taking P as center and same radius cut another arc which intersect the first arc at point Q.Step 7:-Join BQ.At last we get angle QBC=40 degree._BY:-SHIVAM_PALAN"> BY:-SHIVAM PALANP.NO. +91 9371885859ADD.RING ROAD NEARSHIVAM GIRL'S HOSTELGONDIA-441601(MAHARASHTRA)
At 7 o'clock the hands on an analogue clock make a 210 degree angle - going from 12, clockwise, to 7.
pad khaoo !!
Use a ruler
use trisection method
It is possible to construct a 20 degree angle using only Ruler and Compass. I happened to stumble across a method that is highly accurate. It is posted on my blog. Check the related link
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By bisecting an angle of 164 degrees or use the compass with the help of a protractor.
First draw a 90 degree angle .Than draw a 20 degree angle from that 90 degree angle . Than the rest of the angle will be 90-20=70 .Now bisect the 70 degree angle we will get 70/2=35. Now add the rest of the angle means 35+20 =55 GOT 55 DEGREE ANGLE
With the ruler and compass construct a right angle isosceles triangle with a base of 9 cm At 4 cm from the LHS or RHS of the base draw a line that meets the apex of the triangle The angle of this line will be 40 degrees because each 1 cm of base space represents 10 degrees when joined to the apex
In conjunction with a straight edge and a protractor.
Draw a point, and a long straight line through it. Put the centre of the compass over the point, with north on the compass (or zero degrees) on the line. Then draw a second line out from the point at 80 degrees on the compass. You'll then have a 80 degree angle between the lines. It's usually a trick that teachers decide to do on their pupils. A compass is what you use to find north and a pair of compasses is used to draw circles.
bisect between 120 and 180 degree ( 120 + 180= 300/2 =150)
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.