How to Calculate Area, Radius, Diameter, Circumference of Circle?

About this Tutorial:

Find How to Calculate Area, Radius, Diameter, Circumference of Circle with known single value of a circle

How to calculate, If you know a circle has an Area (A) of 19.6 square units, you can calculate Radius (r), Diameter (D), and Circumference (C) as follows:

Radius (r) = √ (A ÷ π)
Radius (r) = √ (19.6 ÷ 3.14159)
Radius (r) = √ (6.238879038957981)
Radius (r) = 2.4977737626138796

Circumference (C) = π * (r * 2)
Circumference (C) = 3.14159 * (2.4977737626138796 * 2)
Circumference (C) = 3.14159 * (4.995547525227759)
Circumference (C) = 15.6939754059142

Diameter (D) = r * 2
Diameter (D) = 2.4977737626138796 * 2
Diameter (D) = 4.995547525227759

How to calculate, If you know a circle has a Circumference (C) of 15.7, you can calculate Area (A), Diameter (D), and Radius (r) as follows:

Diameter (D) = C ÷ π
Diameter (D) = 15.7 ÷ 3.14159
Diameter (D) = 4.997465213085514

Radius (r) = D ÷ 2
Radius (r) = 4.997465213085514 ÷ 2
Radius (r) = 2.498732606542757

Area (A) =  π * r * r;
Area (A) =  3.14159 * 2.498732606542757 * 2.498732606542757
Area (A) =  7.84999336938866 * 2.498732606542757
Area (A) =  19.61505096136064 square units

How to calculate, If you know a circle has a Diameter (D) of 6, you can calculate Area (A), Circumference (C), and Radius (r) as follows:

Radius (r) = D ÷ 2
Radius (r) = 6 ÷ 2
Radius (r) = 3

Circumference (C) = π * (r * 2)
Circumference (C) = 3.14159 * (3 * 2)
Circumference (C) = 3.14159 * (6)
Circumference (C) = 18.84955592153876

Area (A) =  π * r * r;
Area (A) =  3.14159 * 3 * 3
Area (A) =  9.424769999999999 * 3
Area (A) =  28.274333882308138 square units

How to calculate, If you know a circle has a Radius (r) of 4, you can calculate Area (A), Diameter (D), and Circumference (C), as follows:

Diameter (D) = r * 2
Diameter (D) = 4 * 2
Diameter (D) = 8

Circumference (C) = π * (r * 2)
Circumference (C) = 3.14159 * (4 * 2)
Circumference (C) = 3.14159 * (8)
Circumference (C) = 25.132741228718345

Area (A) =  π * r * r;
Area (A) =  3.14159 * 4 * 4
Area (A) =  12.56636 * 4
Area (A) =  50.26548245743669 square units

Trapezoid Calculator | Area, Perimeter, Median of a Trapezium Calculation

Trapezoid Calculator

About Trapezoid Calculator:

Trapezoid or trapezium calculator to is a online tool used to find the Area, Perimeter and Median of a trapezium.

What is Trapezoid?

A trapezoid is a 4-sided geometric figure with straight sides that has a pair of  parallel opposite sides.

Area of a Trapezoid Calculator

Formula:

Area of Trapezium =  ((a+b) / 2)  × h

Base Length A :	m
Base Length B :	m
Height :	m
Area of a Trapezoid :	m2

Example:

A Trapezium's two bases are 8m and 4m, and it is 3m high. Calculate is its Area?

Trapezium Area = (8m + 4m)/2 × 4m = 6m × 4 m = 24 m²

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Perimeter of a Trapezoid Calculator

Formula:

Perimeter of a Trapezoid = a+b+c+d

Side Length A :	cm
Side Length B :	cm
Side Length C :	cm
Side Length D :	cm
Perimeter of a Trapezoid :	cm

Example:
A trapezoid has side length of 8 cm, 11 cm, 6 cm and 13 cm, what is its Perimeter?

Perimeter = 8 cm + 11 cm + 6 cm + 13 cm = 38 cm

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Median of a Trapezoid Calculator

Formula:

Median m =  (a+b) / 2

Base Length A :
Base Length B :
Median of a Trapezoid :

Area of a Right Triangle Calculator - Base * Height

Area of a Right Triangle Calculator

Formula:-

The area of a right-angle triangle can be calculated by using following formula:

Area of a Right Triangle (A) = 1/2(base * height)

Enter the Base:	meters
Enter the Height:	meters
Area of a Right Triangle	meters

Example:

Calculate area of a right-angle triangle with a base of 4 meters and a height of 3 meters.

Area of a Right Triangle = 1/2(bh)
    = 1/2(4 * 3)
    = 1/2(12)
    = 6

Related Calculator:

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• Triangle Theorems Calculator

• Rectangle Area Calculator

Rectangle Area Calculator

Rectangle Area Calculator

Rectangle Area Calculator. The online "Rectangle Area Calculator" is used to calculate the area of a rectangle. The area of all rectangle is equal to the product of the length multiplied by the width.

Formula:-

Area of rectangle A = (length)(width)

        Enter the length (L)     Feet

         Enter the width (W)    Feet

           Area of Rectangle    Ft²  

                                          

Example:-

Find the area of a rectangle that has a length of 5 feet and width of 3 feet?

Area of Rectangle = length x width 

                              = 4ft x 3 ft

Area of Rectangle = 12 ft²



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