Right Angle

Q. How many right angles does an hour hand makes if it moves in a clockwise direction from 12 to 9?

1. 2
2. 3
3. 1
4. 4

Q.

Match the columns.

Column 1	Column 2
Straight angle	Less than one-fourth of a revolution.
Right angle	More than half a revolution
Acute angle	Half of a revolution
Obtuse angle	One-fourth of a revolution
Reflex angle	Between $\frac{1}{4}$ and $\frac{1}{2}$ of a revolution

Q. How many right angles make a complete angle?

1. 1
2. 2
3. 3
4. 4

Q.

Question 4 (a)

Measure the angle given below, using the protractor and write down the measure:

Q. What type of angle is formed between the hour hand and the minute hand of a clock at 9 a.m?

Q.

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

$2$ to $5$

Q.

Find the sum of 3 right angles.

1. ${90}^{\circ }$

2. ${180}^{\circ }$

3. ${270}^{\circ }$

4. ${360}^{\circ }$

Q. What is the angle between south-west and north-west?

1. $0^o$
2. ${45}^o$
3. ${90}^o$
4. ${180}^o$

Q.

Question 5 (f)

Find the number of right angles turned through by the hour hand of a clock when it goes from:
12 to 6

Q.

Question 1

What is the measure of (i) a right angle? (ii) a straight angle?

Q. In the figure, given below name:

$\left(ii\right)$ Two acute angles

Q. If the sum of two angles is less than 90°, then the angles are:

1. right angles
2. obtuse angles
3. acute angles
4. reflex angles

Q. Generally, the angle between the wall of a room and the floor is degrees.

Q.

Which best describes a 90 degree angle?

1. Obtuse Angle

2. Reflex Angle

3. Acute Angle

4. Right Angle

Q.

Question 5 (e)

Find the number of right angles turned through by the hour hand of a clock when it goes from:
12 to 9

Q.

Neha and Riya start from a common point O. Neha moves in the north direction and Riya moves in the east direction. Draw their paths and name them N and E, respectively. What kind of angle is formed between their paths.

Q.

When a clock is showing time as 03:00, the angle included between the hour and the minute hand is called-

1. right angle

2. straight angle

3. acute angle

4. zero angle

Q. At 2:15 o'clock, the hour and minute hands of a clock form an angle of:

1. $7\frac{1}{2}\circ$
2. ${30}^{\circ }$
3. $22\frac{1}{2}\circ$
4. $5^{\circ }$

Q. On a circle protractor, right angle is

1. less than a quarter circle
2. greater than a quarter circle
3. exactly equal to a quarter circle
4. none of these

Q.

Which direction will you face if you turn to the left forming an angle of $270°$ while facing the rising sun

Q.

A boy buys a pizza and starts putting sauce around it. He turns his hand around the pizza for six and a half times. How many right angles did he turn through? [3 MARKS]

Q. The angle which is greater than 90° but less than 180 ° is known as ________.

1. reflex angle
2. acute angle
3. obtuse angle
4. right angle

Q.

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

$4to7$

Q.

In the given figure, identify the right angle.

1. $\angle ABC$

2. $\angle ACD$

3. $\angle CAB$

4. $\angle ADB$

Q. Which of the following is an obtuse angle?

1. 250°
2. 85°
3. 145°
4. 195°

Q. At $9:00$ am, is the angle between the hour and minute hand form a right angle?

1. Yes
2. No

Q. Which of these angles is NOT equal to angle 5?

1. Angle 3
2. Angle 1
3. Angle 7
4. Angle 6

Q.

Which of the following angles in the diagram are acute?

(A) ∠A (B) ∠C (C) ∠B + ∠C (D) ∠D

Q. What type of angle is $\angle$A?

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

Q.

Which of the following is an example of right angle?

1. Angle between the sides of your pentagonal room floor.

2. The angle between the sides of a set square.

3. Angle included between the hour hand and minute hand when it is $12:15$ in your wall clock.

1. 1

2. 2

3. 1 & 3

4. 2 & 3