The ratio between the circumference and diameter of any circle is________ .

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π

A line segment which joins any two points on a circle is a _________.

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chord

The longest chord of a circle is __________.

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diameter

The radius of a circle of diameter 24 cm is __________.

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12 cm

A part of circumference of a circle is called as ________.

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circular arc

Area of a circle

(1)

Cylinder

Circumference of a circle

(2)

πr²

Area of the sector of a circle

(3)

\(=\frac { { \theta }^{ 0 } }{ { 360 }^{ 0 } } \times { \pi r }^{ 2 }\)

Circumference of a semicircle

(4)

\(2{ \pi r }^{ }\)

(5)

(π + 2)r