Page 146 - Math Skill - 4

144 Maths

6. For each of the following figures name the diameter and two radii.

(a) A (b)
(i) Diameter___ (i) Diameter______

O (ii) Radius____ M P N (ii) Radius______
(iii) Radius____ (iii) Radius______

B

7. The diameter of a wheel is 100 cm. Find its radius. Is it more than the diameter?

Solid Shapes

Solids can be of various shapes. The outside of a solid is called its Face
surface. The surface may be plane or curved. A solid object is defined
by number of faces, edges and vertices it has. Edge

™ A face is a flat side of a solid.
Vertex
™ An edge is where 2 faces of a solid meet.
™ A vertex is a point where 3 or more edges meet.
Some solid shapes are described here.
Cube Edge

A cube has 6 flat faces, 12 edges and 8 vertices. All the six faces of a
cube are squares. Vertex
Face
Cuboid Edge

A cuboid has 6 flat faces, 12 edges and 8 vertices. All the six
faces of a cuboid are rectangles.
Vertex
Face

Cone Vertex
A cone has 1 flat face, 1 curved face, 1 curved edge and 1 vertex. Curved face

Challenge Curved edge

I m a line that starts at a point but I go on Flat face
forever, no end to Joint what am I, can you say?
In geometry, I am called a ______ Curved Flat Face
edge
Cylinder Curved face
A cylinder has 2 flat faces, 1 curved face and 2 curved edges.
Curved Flat face
edge