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What is the area of a circle with diameter 77 feet?

Here is the answer to questions like: how to find the area of a circle with diameter 77 feet?

Use the this circle area calculator below to find the area of a circle given its diameter, or other parameters. To calculate the area, you just need to enter a positive numeric value in one of the 3 fields of the calculator. You can also see at the bottom of the calculator, the step-by-step solution.

Area of a Circle Calculator

Formulas:

Circle area formula

Inputs:

 or
 or

Result:

The area of a circle with diameter 77 is 4657

Solution Steps:

Area of a cicle in terms of radius:

Area = π . r2 = 3.14 × 38.52 = 4657 square feet.

In terms of diameter:

Area = π . (d/2)2 = 3.14 × (77/2)2 = 3.14 × (38.5)2 = 4657 square feet.

In terms of circumference:

Area = C2/(4π) = 241.92/ = 58515.61/(4 × 3.14) = 58515.61/(12.56) = 4657 square feet.

Note: for simplicity, some results may be rounded to nearest hundredth and π was rounded to 3.14. See formula details below in this page.

A circle of radius = 38.5 or diameter = 77 or circunference = 241.9 feet has an area of 4657 square feet which is equal to:

  • 0.0004326 square kilometers (km²)
  • 432.6 square meters (m²)
  • 4326000 square centimeters (cm²)
  • 0.1069 acres (ac)
  • 0.04326 hectares (ha)
  • 0.000167 square miles (mi²)
  • 517.4 square yards (yd²)
  • 670600 square inches (in²)
  • Formula for area of a circle

    Here a three ways to find the area of a circle (formulas):

    Circle area formula in terms of radius

    Circle area formula in terms of radius

    Circle area formula in terms of diameter

    Circle area formula in terms of diameter

    Circle area formula in terms of circumference

    Circle area formula in terms of circumference

    See below some definitions related to the formulas:

    Circumference

    Circumference is the linear distance around the circle edge.

    Radius

    The radius of a circle is any of the line segments from its center to its perimeter. The radius is half the diameter or r = d/2.

    Diameter

    The diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints lie on the circle. The diameter is twice the radius or d = 2r.

    The Greek letter π

    π represents the number Pi which is defined as the ratio of the circumference of a circle to its diameter or π = C / d. For simplicity, you can use Pi = 3.14 or Pi = 3.1415. Pi is an irrational number. The first 100 digits of Pi are: 3.1415926535 8979323846 2643383279 5028841971 6939937510 5820974944 5923078164 0628620899 8628034825 3421170679 ...

    Note:

    If you input the radius in centimeters, you will get the answer in square centimeters (cm²), if in inches, will get the answer in square inches (in²) and so on ...

    Circumference is often misspeled as circunference.

    You can use our area unit converter to see the results in other units.

    Disclaimer

    While every effort is made to ensure the accuracy of the information provided on this website, we offer no warranties in relation to these informations.