**Circle : **

**Formulas : **

Area of circle = Πr^{2}

Circumference of circle = 2Πr

Example problems of area of circle

Example problems of circumference of circle

**Semicircle : **

**Formulas : **

Area of semicircle = Πr^{2 }/ 2

Circumference of circle = Πr

Example problems on semi circle

**Quadrant : **

**Formulas : **

Area of quadrant = Πr^{2 }/ 4

Example problems on quadrant

**Equilateral Triangle :**

**Formulas : **

Area of equilateral triangle = (√3/4)a^{2}

Perimeter of equilateral triangle = 3a

Example problems on equilateral triangle

**Scalene Triangle :**

**Formulas : **

Area of scalene triangle = √[s(s-a)(s-b)(s-c)]

Perimeter of scalene triangle = a + b + c

Example problems on scalene triangle

**Parallelogram**** :**

**Formulas : **

Area of parallelogram = b x h

Perimeter of parallelogram = 2(a + b)

Example problems of perimeter of parallelogram

**Quadrilateral : **

**Formulas : **

Area of quadrilateral = (1/2) x d x (h_{1 }+ h_{2})

Perimeter of quadrilateral = a + b + c + d

Example problems of area of quadrilateral

**Rectangle : **

**Formulas : **

Area of rectangle = l x w

Perimeter of rectangle = 2(l + w)

Examples problems on area of rectangle

Examples of perimeter of rectangle

**Square :**

**Formulas : **

Area of square = a x a

Perimeter of square = 4a

Examples problems on area of square

Examples problems on perimeter of square

**Rhombus :**

**Formulas : **

Area of rhombus = (d_{1} x d_{2}) / 2

Perimeter of rhombus = 4a

Examples problems on area of rhombus

Examples problems on perimeter of rhombus

**Trapezoid : **

**Formulas : **

Area of trapezoid = h(a + b) / 2

Perimeter of trapezoid = a + b + c + d

Examples problems on area of trapezoid

**Sector : **

**Formulas : **

Length of arc (l) = (θ/360) ⋅ 2Πr

When we know the radius "r" of the circle and central angle "θ" of the sector :

Area of the sector = (θ/360°) ⋅ Π r^{2}

When we know the radius "r" of the circle and arc length "l":

Area of the sector = (l ⋅ r) / 2

Worksheet for length of arc

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