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 90o?
An angle which exactly measures 90o is called a right angle.
What do we call an angle whose measurement is exactly equal to 0o?
What is an angle which measures exactly 180o 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 (°). Radian-scale 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 169o angle?
An angle which lies between 90o and 180o is called as an obtuse angle. So, 169o 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 ?
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 20o?
Complementary angles add up to 90o . ∠PQR = 20o ⇒ Its complementary angle is 90o−20o = 70o
What is the supplementary angle of 120o?
The sum of supplementary angles is 180o. ∠ABC = 120o ⇒ Its supplementary angles add up to 180o.
What is the measure of a comple-mentary angle of an angle greater than 45o?
Since the complementary angle of 45° is 45°, if the angle is greater than 45° its complement will be lesser than 45°.