Page 263 - ICSE Math 6

CIRCLES

Circle Parts of a Circle
A simple closed curve formed by all the
points in a plane which are at a fixed Centre: The fixed point inside the circle from which all the points
distance from a fixed point in the plane. on the circle are at a fixed distance.

Radius: The distance between the centre and any point on the circle.
Chord: A line segment joining any two points on the circle.
Secant Tangent
A straight line A straight line Segment: A chord of a circle divides it into two segments.
which intersects which touches the Diameter: A chord passing through the centre of the circle.
a circle at two circle at only one
distinct points. point.
Circumference: Length of boundary of the circle.

Arc: A part of the circumference.

A B Sector: A region bounded by two radii and an arc of the circle.
A

THREE-DIMENSIONAL SHAPES

Three-Dimensional Shapes
Figure Name No. of faces No. of edges No. of vertices Net

Cuboid 6 12 8

Cube 6 12 8

Square pyramid 5 8 5

Triangular 4 6 4
pyramid

Triangular prism 5 9 6

Sphere 1 0 0 Not possible

Cone 2 1 1

Cylinder 3 2 0

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