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

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.

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 90Right angleEqual to 90Obtuse angleGreater than 90 & less than 180Straight angleEqual to 180

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

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.

How many degrees are there in a circle? ___ ( write in numerals )

#### SOLUTION

Solution :

There are 360 degrees in a circle.

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.

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.

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.
D.

#### 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.

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

#### SOLUTION

Solution :

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

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. 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.