all the formulas of areas related to circle

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Areas Related to Circlesareas relatedAreas Related to Circles

1: For a circle with radius r,

• circumference=2r
• area=r²
• area of semicircle=1/2 x r²
• peimeter of semicircle=r+2r

2:Arc that subtends angle Θ at the circle

• lenght of the arc=2r x Θ/360
• area of the sector=r² x Θ/360
• perimeter of sector=2r + Θ/360 x 2r
• area of minor segment = area of sector - area of triangle
• perimeter of the minor segment = Θ/360 x 2r - 2rsinΘ/360