Free Introduction to Geometry 02 Practice Test - 4th Grade 

Question 1

Identify the angle marked in red.

A. Acute angle
B. Obtuse angle
C. Reflex angle
D. Right angle

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?

A. Acute angle
B. Obtuse angle
C. Right angle
D. Straight angle

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)?

A. 35∘
B. 88∘
C. 95∘
D. 195∘

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? ___ ( write in numerals )

SOLUTION

Solution :

There are 360 degrees in a circle.

Question 5

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

A. Irregular shape
B. Rectangular shape
C. Triangle
D. Regular shape

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.

A. True
B. False

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!)

A. G
B. P
C. B 
D. V 

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 ___ objects.

SOLUTION

Solution :

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

Question 9

Which of the following angles is a straight angle?

A. 45∘
B. 90∘
C. 110∘
D. 180∘

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.

A. straight
B. acute
C. obtuse
D. reflex

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.
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