Which of the following are the units of an angle?
A common unit of measurement of angles is degrees.
What do we call an angle which exactly measures 90^{o}?
An angle which exactly measures 90^{o }is called a right angle.
What do we call an angle whose measurement is exactly equal to 0^{o}?
What is an angle which measures exactly 180^{o} called?
Which instrument is used to measure or construct angles?
A protractor is a measuring instrument, typically made of transparent plastic or glass, for measuring angles. Most protractors measure angles in degrees (°). Radianscale protractors measure angles in radians.
How many rays can be drawn from a given point?
An infinite number of rays can be drawn from a point.
What do we call a 169^{o} angle?
An angle which lies between 90^{o }and 180^{o} is called as an obtuse angle. So, 169^{o} is an obtuse angle.
What happens to the measurement of an angle after the extension of its arms?
Extending the arms of an angle does not affect the angle between them.
In ∠ROP, what is the vertex?
The vertex of an angle is the common point of the rays that form the arms of an angle. Here, it is O.
What are the two arms of ZDEF?
are the two arms of ∠DEF.
When two line segments meet at a point forming right angles, what type of segments are they called?
Perpendicular segments meet at a point forming right angles.
How is is perpendicular to written symbolically?
What is the measure of ∠QOR ?
The correct option is Option C.
If OQ is perpendicular on PR, it means it forms right angles on both the sides.
∠QOP = ∠QOR = 180° ÷ 2 = 90°
A line AB is parallel to the line CD. How is this symbolically written?
What are the lines which lie on the same plane and do not intersect at any point called?
Since parallel lines are the lines which have equal distance throughout. So they never meet because they have constant distance between them.
When two lines are parallel, what is the distance between them?
The distance between the parallel lines is the same.
What is the number of pairs of parallel lines in the given figure?
There are two pairs of parallel lines as the opposite sides of a rectangle are parallel.
What is the complementary angle of 20^{o}?
Complementary angles add up to 90^{o} . ∠PQR = 20^{o }⇒ Its complementary angle is 90^{o}−20^{o }= 70^{o}
What is the supplementary angle of 120^{o}?
The sum of supplementary angles is 180o. ∠ABC = 120^{o} ⇒ Its supplementary angles add up to 180^{o}.
What is the measure of a complementary angle of an angle greater than 45^{o}?
Since the complementary angle of 45° is 45°, if the angle is greater than 45° its complement will be lesser than 45°.
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