Shapes and Angles Test 3

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Shapes and Angles Test 3

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following are acute angles?

A
a and c

B
a and b

C
c and d

D
b and d

Solution

From the figure it is clearly visible that 'a' and 'b' are acute angles which lies between $$\displaystyle { 0 }^{ o }$$ to $$\displaystyle { 90 }^{ o }$$.
Question 2
1 / -0

An angle that is $$\displaystyle  { 1 }^{ o }$$ less than right angle is:

A
Reflex angle

B
Straight angle

C
Obtuse angle

D
Acute angle

Solution

Right angle measures $$\displaystyle  { 90 }^{ o }$$
$$\displaystyle  { 1 }^{ o }$$ less of right angle = $$\displaystyle { 90 }^{ o }-{ 1 }^{ o }$$
$$\displaystyle { 89 }^{ o }$$
Which is an acute angle.
Acute angle is the angle which is greater than $$\displaystyle { 0 }^{ o }$$ and less than $$\displaystyle { 90 }^{ o }$$.
Obtuse angle is the angle which is greater than $$\displaystyle { 90}^{ o }$$ and less than $$\displaystyle {180 }^{ o }$$.
Right angle is the angle which is equal to $$90^o$$.
Reflex angle is the angle which is greater than $$\displaystyle {180}^{ o }$$ and less than $$\displaystyle {360 }^{ o }$$.
Question 3
1 / -0

Sum of right angles is $$\displaystyle { 720 }^{ o }$$. Find no. of right angles.

A
$$8$$

B
$$9$$

C
$$10$$

D
$$7$$

Solution

One right angle = $$\displaystyle { 90 }^{ o }$$
Sum of right angle = $$\displaystyle { 720 }^{ o }$$
No. of right angles = $$\displaystyle \frac { { 720 }^{ o } }{ { 90 }^{ o } } ={ 8 }$$
Question 4
1 / -0

An angle which measures $$180^{\circ}$$ is called_______angle.

A
zero

B
right

C
straight

D
acute

Solution

An angle which measures $$ {180}^{o} $$ is called a straight angle.
Question 5
1 / -0

$$\displaystyle 96^{0}$$ is an example of-

A
Acute

B
Obtuse

C
Right

D
None of these

Solution

obtuse angles are those angles which are greater than 90 degrees and less than 180 degrees..
so,96 degrees is an example of obtuse angle..
Question 6
1 / -0

Which of the following is obtuse angle?

A
Two right angles

B
One and half right angles

C
One right angle

D
Half a right angle

Solution

Right angle $$=90^{\circ}$$
One and half right angle $$=\dfrac { { 90 }^{ \circ } }{ 2 } +{ 90 }^{ \circ }={ 135 }^{ \circ }$$
which is greater than $$90^{\circ}$$
So it is an obtuse angle .
Option $$B$$ is correct.
Question 7
1 / -0

Measure of an obtuse angle is:

A
$$> 0^{\circ}, < 90^{\circ}$$

B
$$> 90^{\circ}, < 180^{\circ}$$

C
$$> 0^{\circ}, < 270^{\circ}$$

D
$$> 0^{\circ}, < 180^{\circ}$$

Solution

Measure of an obtuse angle is always greater than $$0^o$$ and less than $$180^o$$.
Therefore, it can be written as
Obtuse angle is $$>$$ $$90^{\circ}$$ & $$<$$ $$180^{\circ}$$
Question 8
1 / -0

$$\displaystyle 170^{0}$$ is an example of-

A
Acute

B
Right

C
Obtuse

D
None of these

Solution

angles greater than 90 degrees and less than 180 degrees are known as obtuse angles..
hence 170 degrees is an example of obtuse angle..
Question 9
1 / -0

Which of the following is not an obtuse angle ?

A
$$\displaystyle { 127 }^{ o }$$

B
$$\displaystyle { 149 }^{ o }$$

C
$$\displaystyle { 175 }^{ o }$$

D
$$\displaystyle { 182 }^{ o }$$

Solution

Acute angle is the angle which is greater than $$\displaystyle { 0 }^{ \circ }$$ and less than $$\displaystyle { 90 }^{ \circ}$$.
Obtuse angle is the angle which is greater than $$\displaystyle { 90}^{ \circ }$$ and less than $$\displaystyle {180 }^{ \circ }$$.
Right angle is the angle which is equal to $$90^{\circ}$$.
Reflex angle is the angle which is greater than $$\displaystyle {180}^{ \circ }$$ and less than $$\displaystyle {360 }^{ \circ }$$.
$$\therefore \displaystyle { 182 }^{ \circ }$$ is a reflex angle, so it is not an obtuse angle.
Question 10
1 / -0

Range of an obtuse angle is:

A
$$[0˚, 90˚)$$

B
$$(0˚, 90˚]$$

C
$$[90˚, 180˚)$$

D
$$(90˚, 180˚)$$

Solution

Acute angle is the angle which is greater than $$\displaystyle { 0 }^{ o }$$ and less than $$\displaystyle { 90 }^{ o }$$.
Obtuse angle is the angle which is greater than $$\displaystyle { 90}^{ o }$$ and less than $$\displaystyle {180 }^{ o }$$.
Right angle is the angle which is equal to $$90^o$$.
Reflex angle is the angle which is greater than $$\displaystyle {180}^{ o }$$ and less than $$\displaystyle {360 }^{ o }$$.

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Shapes and Angles Test 3

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Shapes and Angles Test 3

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SHARING IS CARING

Question 1

a and c

a and b

c and d

b and d

Solution

Question 2

Reflex angle

Straight angle

Obtuse angle

Acute angle

Solution

Question 3

$$8$$

$$9$$

$$10$$

$$7$$

Solution

Question 4

zero

right

straight

acute

Solution

Question 5

Acute

Obtuse

Right

None of these

Solution

Question 6

Two right angles

One and half right angles

One right angle

Half a right angle

Solution

Question 7

$$> 0^{\circ}, < 90^{\circ}$$

$$> 90^{\circ}, < 180^{\circ}$$

$$> 0^{\circ}, < 270^{\circ}$$

$$> 0^{\circ}, < 180^{\circ}$$

Solution

Question 8

Acute

Right

Obtuse

None of these

Solution

Question 9

$$\displaystyle { 127 }^{ o }$$

$$\displaystyle { 149 }^{ o }$$

$$\displaystyle { 175 }^{ o }$$

$$\displaystyle { 182 }^{ o }$$

Solution

Question 10

$$[0˚, 90˚)$$

$$(0˚, 90˚]$$

$$[90˚, 180˚)$$

$$(90˚, 180˚)$$

Solution

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