The DAV Maths Book Class 3 Solutions and **DAV Class 3 Maths Chapter 12 Brain Teasers** Solutions of Geometry offer comprehensive answers to textbook questions.

## DAV Class 3 Maths Ch 12 Brain Teasers Solutions

Question 1.

Tick (✓) the correct answer.

(a) A sphere has ______ plane surfaces.

(i) three

(ii) six

(iii) no

(iv) four

Solution:

(iii) no

(b) A cube has ______ vertices.

(i) eight

(ii) six

(iii) twelve

(iv) four.

Solution:

(i) eight

(c) All the faces of a cube are ______.

(i) rectangles

(ii) circles

(iii) triangles

(iv) squares.

Solution:

(iv) squares.

(d) A birthday cap represents a ______.

(i) cone

(ii) triangle

(iii) cube

(iv) cylinder.

Solution:

(i) cone.

(e) Your Mathematics textbook represents a

(i) rectangle

(ii) cube

(iii) cuboid

(iv) square.

Solution:

(i) rectangle.

Question 2.

How many line segments are there in the following figures?

Solution:

4, 4, 10, 4.

Question 3.

Draw the line segments of the following lengths.

(a) 5 cm

Solution:

(b) 7.3 cm

Solution:

(c) 4.4 cm

Solution:

(d) 6.7 cm

Solution:

Question 4.

Write two example of objects having the shape of:

(a) Cuboid

Solution:

- Brick
- Match stick box

(b) Circle

Solution:

- Bangles
- Chapati

(c) Square

Solution:

- Photo Frame
- Tiles.

(d) Cone

Solution:

- Birthday cap
- Ice cream.

(e) Cylinder

Solution:

- Rolling pins
- Batteries

(f) Sphere

Solution:

- Marbles
- Balls

Question 5.

How many triangles are there in the given figure?

Solution:

5

Question 6.

How many squares are there in the given figure?

Solution:

8

Question 7.

How many line segments are there in the given figure?

Solution:

7

Additional Questions:

Question 1.

Fill in the blanks.

(a) In a rectangle, the ______ sides are equal.

Solution:

opposites

(b) A circle has side and ______corners.

Solution:

no

(c) A cube has ______ faces and ____ edges.

Solution:

6, 12

(d) A sphere has 1 _______ face.

Solution:

curved

(e) A cylinder has _____ flat surface, _____ curved face ______ edges.

Solution:

2, 1, 2

Question 2.

How many corners, how many sides?

(a)

Solution:

Corners – 7

sides – 7

(b)

Solution:

Corners – 5

sides – 7

(c)

Solution:

Corners – 4

sides – 8

Question 3.

Name all the line segments in each shape.

(i)

Solution:

AB, AC, BC

(ii)

Solution:

AB, BC, CD and AD

(iii)

Solution:

TS, SR, RQ, PQ, TP

Question 4.

State true or false.

(i) We can draw many lines through one point.

Solution:

True

(ii) Rolling pins and batteries are cylinder.

Solution:

True

(iii) All the edges of cuboid are equal.

Solution:

False

(iv) Sphere have one edge and one flat surface.

Solution:

False

(v) Matchbox, bricks, rooms and cupboards are not cuboids.

Solution:

False

Question 5.

Draw a line segments of following length.

(a) 6 cm

Solution:

(b) 2.5 cm

Solution:

(c) 4.2 cm

Solution: