How To Find The Area Of A Sector Of A CircleIf the arc subtends an angle of θ at the centre, then its arc length isHence, the arc length 'l' of a sector of angle θ in a circle of radius r is given byIf the arc subtends an angle θ, then area of the corresponding sector isThus, the area A of a sector of angle θ in a circle of radius r is given by= × … [Read more...] about How To Find The Area Of A Sector Of A Circle

# Circles

## Area of Polygons and Circles

Area of Polygons and Circles Area formulas can be found at "Reference Table for Areas" Let's pick up some hints for those more challenging problems involving area.Regular polygons have a center and a radius (coinciding with their circumscribed circle), and the distance from the center perpendicular to any side is called its apothem.The apothem of a regular polygon … [Read more...] about Area of Polygons and Circles

## How To Calculate The Perimeter Of A Circle

Perimeter Of A Circle Circumference of a Circle Circumference means, ‘the perimeter of a circle’. The word has been derived from the Latin word circumferre means to carry around. The distance around a circular region is also known as its circumference.Note:The ratio of circumference to diameter is approximately the same around 3.142. i.e. The circumference of a … [Read more...] about How To Calculate The Perimeter Of A Circle

## How To Calculate The Area Of A Circle

How To Calculate The Area Of A Circle A circle is the locus of a point which moves in a plane in such a way that its distance from a fixed point always remains same. The fixed point is called the centre and the given constant distance is known as the radius of the circle. The perimeter of a circle is known as its circumference. If r is the radius of a circle, then (i) … [Read more...] about How To Calculate The Area Of A Circle

## Theorems and Postulates for Geometry

Theorems and Postulates for Geometry This is a partial listing of the more popular theorems, postulates and properties needed when working with Euclidean proofs. You need to have a thorough understanding of these items. General:Reflexive Property A quantity is congruent (equal) to itself. a = aSymmetric Property If a = b, then b = a.Transitive … [Read more...] about Theorems and Postulates for Geometry