Right, Straight and Complete Angles

Q.

Let $x=4$be a directrix to an ellipse whose center is at the origin and its eccentricity is $\frac{1}{2}$. If$P(1,\beta ),\beta >0$ is a point on this ellipse, then the equation of the normal to it at $P$ is :

1. $8x-2y=5$

2. $4x-2y=1$

3. $7x-4y=1$

4. $4x-3y=2$

Q.

Two intersecting lines are called what if they make a right angle

Q.

Question 3 (c)

Which direction will you face if you start facing:

West and makes $\frac{3}{4}$ of a revolution anti-clockwise?

Q. When a clock strikes 12:00, what is the angle between the hour hand and the minute hand called?

1. Straight angle
2. Zero angle
3. Right angle
4. Acute angle

Q.

Question 3 (a)

Which direction will you face if you start facing:

East and make $\frac{1}{2}$ of a revolution clockwise?

Q.

The angle between the lines given by $x^2-y^2=0$ is

1. $15°$

2. $45°$

3. $75°$

4. $90°$

Q.

What part of a revolution have you turned through if you stand facing:

West and turn clockwise to face east?

Q.

Name the angle $35°$ as acute or obtuse or straight or reflex or right angle.

Q.

Draw rough diagrams of two angles which have (a) One point common (b) Two points in common (c) Three points in common (d) Four points in common (e) One ray in common.

Q.

What is the angle formed between north and south direction?

1. Acute angle

2. Straight angle

3. Right angle

4. Obtuse angle

Q.

When we write $\angle A=\angle B$, we actually mean _________

Q.

Find, in degrees, the size of an angle equal to $\frac{3}{8}$ turn.

Q.

Question 5 (b)

Find the number of right angles turned through by the hour hand of a clock when it goes from:
2 to 8

Q.

Question 1 (a)

What fraction of a clockwise revolution does the hour hand of a clock turn through, when it goes from
3 to 9

Q.

Question 4 (b)

What part of a revolution have you turned through if you stand facing:
South and turn clockwise to face east?

Q.

What is one revolution?

Q.

Question 32

State whether the given statement is True or False.

A horizontal line and a vertical line always intersect at right angles.

Q. What is an angle that measures ${360}^{\circ }$ called?.

1. Complete angle
2. Obtuse angle
3. Right angle
4. Straight angle

Q.

How many degrees are there in $\frac{3}{5}$of right angles ?

Q.

If an angle is $\frac{3}{5}$ of its supplement. Find the angle

Q.

Question 2 (c)

Where will the hand of a clock stop if it:
Starts at 5 and makes $\frac{1}{4}$ of a revolution, clockwise?

Q.

Question 4
Measures of the two angles between hour and minute hands of a clock at 9 0' clock are
a) ${60}^{\circ },{300}^{\circ }$
b) ${270}^{\circ },{90}^{\circ }$
c) ${75}^{\circ },{285}^{\circ }$
d) ${30}^{\circ },{330}^{\circ }$

Q.

Question 62

Using the given information, name the right angles in each part of the given figure.

a) $BA\perp BD$

b) $RT\perp ST$

c) $AC\perp BD$

d) $RT\perp SW$

e) $AC\perp BD$

f) $AE\perp CE$

g) $AC\perp CD$

h) $OP\perp AB$

Q.

Which direction will you face if you start facing (d) south and make one full revolution? (should we specify clockwise or anti – clockwise for this last question? Why not?)

Q.

Find the measure of an angle, which is equal to its supplement.

Q.

Question 7 (b)

Where will the hour hand of a clock stop if it starts:
from 8 and turns through 2 right angles?

Q.

Find the value of m in $7^m$ = 343.

___

Q.

The unit of plane angle is

Q.

If the wheel of a car makes four complete rotation and half a turn, then the number of right angles through which it turns is:

1. 16

2. 18

3. 20

4. 8

Q.

Classify each one of the following angles as right, straight, acute, obtuse, or reflex: