Page 221 - Maths Skills - 7

Visualising Solid Shapes 219

2. The number of faces with odd number of dots E. Assertion-Reason Based Questions
is— Directions for Questions 1 to 2: In each of the
(i) 3 (ii) 6 questions given below, there are two statements

(iii) 5 (iv) 4 marked as Assertion (A) and Reason (R). Mark your
3. The number of faces of this die is— answer as per the codes provided below:
(i) 10 (ii) 12 (a) Both A and R are true and R is the correct
explanation of A.
(iii) 6 (iv) 8 (b) Both A and R are true but R is not the correct
4. If each side of the die is 2 cm, then the total explanation of A.
surface area of the die is (c) A is true but R is false. (d) A is false but R is true.
(i) 8 cm (ii) 24 cm 2 Q. 1. Assertion (A): The top view of a sphere is a circle.
2
(iii) 12 cm (iv) 4 cm 2 Reason (R): A circle is a 2-dimensional shape.
2
5. The number of vertices of this die is— Q .2. Assertion (A): If we cut a cube vertically, we get

(i) 12 (ii) 8 a square.
(iii) 6 (iv) 5 Reason (R): A cube is like countless squares
stacked together.

INTEGRATED QUESTION

F. Architecture Vs Maths
In architecture, top view, side view and front view of building are imagined and drawn before constructing the
building. Here two famous buildings are given. Draw top view, side view and front view of both the buildings.

HOTS
1. What is the relation between the faces, edges and vertices of polyhedron? An icosahedron has 12 vertices,
20 faces and n edges. Find n.
2. In what respect is the front view of a solid different from its side or top view ? Name a solid having all three
views identical.

Word Stock

Pyramid Prism Cone Diagonal Side Front Top Bottom View
Face Edge Net Vertex Visual Surface Solid Hollow