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6. find the diameter of these objects.

a. b. c.

Radius = 1 cm Radius = 24 cm Radius = 30 cm

7. the following pizzas are cut into a different number of slices. Can you identify the
angle (acute, obtuse, or right) of a pizza slice in each case?

a. b. c. d.

8. Write true or false for the following statements.

a. A circle is a polygon.
b. All radii (plural of radius) of a circle are of equal length.

c. All diameters of a circle are of equal length.

d. A circle has only one diameter.
e. A circle has only one centre.

f. The radius is half of the diameter of a circle.

 There are different types of solids shapes, such as a cube, cuboid, cone, cylinder,
sphere, etc.
 The net of a solid is a layout in a 2D shape that can be folded to form a 3D shape.
 When two lines meet at a point, they create an angle.

 A simple closed figure/shape formed by three or more line segments is called a
polygon.
 Polygons are named according to their sides.

 The boundary of a circle is called the circumference.
 The diameter is the longest straight line between any two points on the boundary of
a circle.

128 Mathematics 4