# Free Introduction to Geometry 02 Practice Test - 4th Grade

### Question 1

Identify the angle marked in red.

#### SOLUTION

Solution :C

The angle shown in the figure is more than a straight angle of 180 degrees and less than a full circle of 360 degrees.

Hence, it is a reflex angle.

### Question 2

What is an angle which is less than 180 degrees but more than 90 degrees called?

#### SOLUTION

Solution :B

Type of angleDescriptionAcute angleLess than 90∘Right angleEqual to 90∘Obtuse angleGreater than 90∘ & less than 180∘Straight angleEqual to 180∘

Thus, an angle that measures less than 180∘ and greater than 90∘ is called an obtuse angle.

### Question 3

Which of the following are acute angle(s)?

#### SOLUTION

Solution :A and B

An angle that is less than 90∘ is called an acute angle.

Hence, 35∘ and 88∘ are less than 90∘.

So, both acute angles.

### Question 4

How many degrees are there in a circle?

#### SOLUTION

Solution :There are 360 degrees in a circle.

### Question 5

What is a shape which has equal sides and equal angles called?

#### SOLUTION

Solution :D

A shape which has equal sides and equal angles is called a regular shape.

For example, a square is a regular shape. It has all its sides equal and all its interior angles equal to 90 degrees.

A rectangle has its opposite sides to be equal, in general.

### Question 6

The figure shown below is a regular shape.

#### SOLUTION

Solution :B

A shape which has equal sides and equal angles is called a regular shape.

In the figure shown, all sides are not equal. Hence, it is not a regular shape.

### Question 7

Which of the following letters have only one line of symmetry?

(This question may have more than one right answer!)

#### SOLUTION

Solution :C and D

The letters G and P do not have any line of symmetry.

The letters B and V have only one line of symmetry each as shown below:

Thus, B and V are letters that have only one line of symmetry.

### Question 8

Objects which have no line of symmetry are called

#### SOLUTION

Solution :Objects which have no line of symmetry are called asymmetrical objects.

### Question 9

Which of the following angles is a straight angle?

#### SOLUTION

Solution :D

An angle which measures 180° is called a straight angle.

### Question 10

An angle which measures 175 degrees is a/an ______ angle.

#### SOLUTION

Solution :C

An angle which measures more than a right angle (90 degrees) and less than a straight angle (180 degrees) is called an obtuse angle.

Since 175 degrees is less than 180 degrees and greater than 90 degrees, it is an obtuse angle.