Step 4: - Taking P as the center and with the same radius draw an arc, that cuts the first arc at a point say, W. Step 3: - Taking S as the center and with the same radius that we had taken previously, draw another arc, that cuts the first arc at P. Step 2: - Taking D as the center and we use a compass to draw an arc of any radius to cut line m at a point say, S.
Protractor and compass how to#
Hence, ∠ROB is the required 120 degrees angle.Ī 90-degree angle is easy to make as it lies exactly between a 120-degree angle and a 60-degree angle and we have already learned how to construct these angles. Mark the point where they intersect as R. Step 4: Similarly, with the same radius on the compass, place the pointer at point Q.
Step 3: Now without changing the radius, place the pointer at point P and make an arc that cuts the previous arc at a point, say Q. With the pencil-head of the compass make an arc which meets the line AB at say a point, P. Step 2: Now we shall take the compass and open it up to any radius and place the pointer of the compass at point O on line AB. Step 3: - Draw a line through the intersection of the two arcs and name it R.Ĭheck Important Notes for Alternate Angles Now place the pointer of the compass at point B and make an arc and similarly make another arc by placing the pointer at point P. We shall bisect the angle by taking the radius as the length between points A and B. Step 2: - Now we are required to bisect the angle. Step 1: - First we shall follow the above-mentioned steps and create a 60-degree angle. Hence the required angle is ∠BOP = 60-degree angle.Ī 30° angle is half of a 60 degrees angle is hence made by bisecting a 60 degrees angle. Step 3: Place the compass pointer at B and mark an arc that passes through A and intersects the previous arc at a point, say P. Place its pointer at A and with the pencil-head make an arc which meets the line AI at say, B. Step 2: Take the compass and open it up to a convenient radius. Step 1: First we shall draw a line segment AI. Here are the steps to be followed while constructing a 60° angle:. The 60 degrees angle is one of the most basic and easiest constructions, using this angle we can construct various other angles. Using this method only a few particular angles can be constructed such as 60°, 120°, 90°, 45°, 30°. We shall now learn how to construct an angle using a compass and ruler. Hence, we form ∠ECD which is the required angle.Ĭonstructing an Angle Using a Ruler and a Compass Step 3: Starting from the 0° mark on the protractor we shall mark the required measure of the angle as point E. Step 2: Now we must place the center of the protractor on point C, such that the line segment CD is aligned with the line of the protractor. Step 1: First we shall draw a line segment CD. We shall use the protractor to mark the measure of the angle and then construct it using a pencil and ruler. It is really simple to construct an angle by using a protractor. Reflex Angle: - An angle whose measure is always more than 180° but less than 360°.įull Rotation Angle: - An angle whose measure is exactly 360°.
Obtuse Angle: - An angle whose measure is greater than 90° but less than 180°. Straight Angle: - An angle whose measure is equal to 180° and this angle looks like a straight line. Right Angle: - An angle whose measure is exactly 90°. There are six types of angles and they can be distinguished based on the degree that they form.Īcute Angle: - An angle whose measure is less than 90°.
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