How do you construct an angle without a protractor?

How do you construct an angle without a protractor?

Bisecting angles without a protractor

1. Place the compass on the vertex of the angle (point B). Draw an arc across each arm of the angle.
2. Place the compass on the point where one arc crosses an arm and draw an arc inside the angle.
3. Use a ruler to join the vertex to the point where the arcs intersect (D).

How do you find a 120 degree angle?

Constructing a 120° Angle: 120° angle can be constructed using the logic that 60° + 120° = 180°. Thus, we can understand that to construct 120° we can construct 60° angle and then further extend one of its arms as shown below in the figure.

What is a 120 degree angle called?

An obtuse angle is a type of angle whose degree measurement is more than 90° but less than 180°. Examples of obtuse angles are: 100°, 120°, 140°, 160°, 170°, etc.

How do you construct a 120 degree and bisect it?

Answer

1. Draw an angle of ∠AOB of 120°.
2. Draw an arc from point O. This arc will cut the ray OA at any point C and ray OB at any point D.
3. Draw two arcs of the same radii from the points C and D as centres.
4. Join the point O to the point M by a ray OM. The ray OM will cut the angle ∠AOB into equal parts.
5. m∠AOM = m∠BOM =

What type of angle is 120?

An obtuse angle is a type of angle whose degree measurement is more than 90° but less than 180°. Examples of obtuse angles are: 100°, 120°, 140°, 160°, 170°, etc. ∠ PQR is an obtuse angle because it’s less than 180° and greater than 90°.

How do you make a 120 degree angle with a protractor?

Place the protractor over EF such that the baseline of the protractor coincides with EF and the midpoint of the baseline coincides with point F. Read markings on the outer semicircle of the protractor and mark point G on 120°. Join F and G with the help of a ruler. We have ∠EFG = 120°.

Is a 120 degree angle obtuse?

120º angle This is an obtuse angle because 120 is a number greater than 90 and less than 180.

Is 120 degrees acute or obtuse?

obtuse angle
This is an obtuse angle because 120 is a number greater than 90 and less than 180.

How to construct an angle of 120° using ruler?

Construct an angle of 120° using ruler and compass Steps of construction Draw a ray OA. Taking O as center and any radius, draw an arc cutting OA at B. 3. Now, taking B as center and with the same radius as before, draw an arc intersecting the previously drawn arc at point C. 4.

How do you construct a 30 degree angle?

Hence, a 30-degree angle is constructed. A 120-degree angle is twice the angle of 60-degree. The steps for construction of 120 degrees angle is given below: Step 1: Draw a line segment. Mark the left end as point O and the right end as point B. Step 2: Take the compass and open it up to a convenient radius.

How to construct an angle of 120° using compass?

Construct an angle of 120° using compass – Ex 11.1 Construct an angle of 120° using ruler and compass Steps of construction Draw a ray OA. Taking O as center and any radius, draw an arc cutting OA at B. 3. Now, taking B as center and with the same radius as before, draw an arc intersecting the previously drawn arc a

How do you construct angles without a protractor?

We can use protractor to construct various types of angles. Also, there are methods by which we can construct some specific angles such as 60°, 30°, 120°, 90°, 45°, etc., without using protractor. Hence, these angles can be constructed using a compass and ruler.