Exercise 13A
Question 1
Fill in the blanks
(a) The common portion of two adjacent faces of cuboid is called an edge.
(b) A plane surface of a solid enclosed by edges is called a face.
(c) The corners of a solid shapes are called its vertices
(d) A solid with no vertex is a sphere
(e) The base of a triangular pyramid is a triangle
Question 2
(a) The faces of a cube are squares
(b) The faces of a cuboid are rectangles
(c) A square pyramid has a square base an triangular faces
(d) The base and top of a prism are parallel congruent polygons
(e) The faces of a prism are parallelograms
Question 3
(a) A solid that has one curved face and two flat circular faces is called cylinder
(b) A solid that has one flat circular face, one curved face and one vertex is called a cone
(c) A solid that has only a curved surface and neither a vertex nor an edge is called a sphere
Question 4
(a) A triangular prism has 5 faces, 9 edges and 6 vertices
(b) A triangular pyramid has 4 faces, 6 edges and 4 vertices
(c) A square pyramid has 5 faces, 8 edges and 5 vertices
Question 5
(a) Two parallel congruent square bases and four other polygon faces
=Square prism
(b) Two parallel, congruent circular bases and one curved surface
=Cylinder
(c) One triangular base and three triangular faces
=Triangular pyramid
(d) One circular base and one curved surface
=Cone
(e) No vertex, no edge , only curve surface
=Sphere
Question 6
(a) 7+10-15=2
(b) 6+8-12=2
(c) 7+7-12=2
(d) 9+9-16=2
Question 7
(a) 4 faces Triangular pyramid
(b) 4 vertices Triangular pyramid
(c) 2 edges Cylinder
(d) 6 vertices Prism
(e) No edges Sphere
(f) 6 faces Cube, Cuboid
Question 8
Which of there solids has the maximum number of vertices?
(c) Cuboid
Question 9
If F=6 and V=4, then the value of E using Euler's formula is
(b) 8
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