Question

All formula of area related to circle ​

Answer 1

Answer:

Area of circle = πr^2

Area of sector = Theta / 360 × π r ^2

Area of segment = ( theta / 360 π × sin theta / 2 cos theta / 2 ) r ^2

Perimeter of circle = 2π r

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Answer 2

the answer is in this attachment

area of quadrant of circle is

$1 \div 4\pi {r}^{2}$

area of semicircle

$1 \div 2\pi {r}^{2}$

area of triangle = 1/2 ×b×h

or

1/2r^2sin^2theta