Page 1 A. PERIMETER AND AREA OF A CIRCLE ? The distance covered by travelling once around a circle is called the perimeter of the circle. It is also called the circumference of the circle. ? Circumference = o = o = ? Area of the circle = B. AREAS OF SECTOR AND SEGMENT OF A CIRCLE ? Sector of a circle ? The portion / part of the circular region enclosed by two radii and the corresponding arc is called a sector of the circle. ? Area (minor sector OPRQ) = ? Area (major sector OPSQ) = = area of the circle area of the minor sector Major Sector O Minor Sector P Q R S Page 2 A. PERIMETER AND AREA OF A CIRCLE ? The distance covered by travelling once around a circle is called the perimeter of the circle. It is also called the circumference of the circle. ? Circumference = o = o = ? Area of the circle = B. AREAS OF SECTOR AND SEGMENT OF A CIRCLE ? Sector of a circle ? The portion / part of the circular region enclosed by two radii and the corresponding arc is called a sector of the circle. ? Area (minor sector OPRQ) = ? Area (major sector OPSQ) = = area of the circle area of the minor sector Major Sector O Minor Sector P Q R S ? Length of an arc of a sector of angle = where, r = radius of the circle ? Perimeter of the sector = + 2r where, r = radius of the circle ? Segment of a circle ? The portion/part of the circular region enclosed between a chord and the corresponding arc is called the segment of the circle. ? The segment containing centre of the circle is called major segment and the segment which doesn’t contain the centre of the circle is called the minor segment. ? Area of minor segment PRQ = Area of sector OPRQ – Area of = – Page 3 A. PERIMETER AND AREA OF A CIRCLE ? The distance covered by travelling once around a circle is called the perimeter of the circle. It is also called the circumference of the circle. ? Circumference = o = o = ? Area of the circle = B. AREAS OF SECTOR AND SEGMENT OF A CIRCLE ? Sector of a circle ? The portion / part of the circular region enclosed by two radii and the corresponding arc is called a sector of the circle. ? Area (minor sector OPRQ) = ? Area (major sector OPSQ) = = area of the circle area of the minor sector Major Sector O Minor Sector P Q R S ? Length of an arc of a sector of angle = where, r = radius of the circle ? Perimeter of the sector = + 2r where, r = radius of the circle ? Segment of a circle ? The portion/part of the circular region enclosed between a chord and the corresponding arc is called the segment of the circle. ? The segment containing centre of the circle is called major segment and the segment which doesn’t contain the centre of the circle is called the minor segment. ? Area of minor segment PRQ = Area of sector OPRQ – Area of = – ? Area of major segment PSQ = Area of circle – Area of minor segment PRQ = C. AREAS OF COMBINATIONS OF PLANE FIGURES ? Finding out the areas of figures made up of two or more figures i.e. combination of figures. ? Finding the areas of different shapes, and add or subtract the areas of another shapes to find out asked area.Read More

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