Can anyone tell me the all …

(1) For a circle of radius r , we have : (a) Circumference of circle = 2πr (b ) Area of circle = πr² (2) For a semicircle of radius r , we have : (a ) Perimeter = (πr + 2r ) (b ) Area = 1/2 × πr² (3 ) For a ring having outer radius = R and ineer radius = r , we have : (a ) Area of the ring = π( R² - r² ) (4 ) Let an arc ACB make an angle ¢° at the centre of a circle of radius r . Then , we have : (a ) Length of minor arc = 2πr ¢ / 360° (b ) Length of major arc = ( 2πr - 2πr theta/360 ) (c ) Area of minor sector = πr² ¢ / 360° Or 1/2 × Radius × arc length ). ( d ) Area of major sector = ( π²r - πr² theta/360) (e ) Area of minor segment = ( πr² theta /360 - 1/2 r² sin theta ) (f ) Area of major segment = [ πr² - ( area of minor segment ) ] (g) Perimeter of sector = ( 2r + 2πr theta /360)