The diameter of a circle is 18 mm. What is the area of the circle in terms of \(\pi\)?
Answer (2)
Area of a circle = pi x radius squared Radius of a circle is from any point on the circumference to the centre Diameter is the distance between two points on the circumference with the line crossing the centre So radius is half of the diameter... In this example radius is therefore 9mm (half of 18mm) Square this... 9x9=81 So in terms of pi the answer is 81pi To get the full answer you would just times pi (3.14) by 81 =254.34
The area of the circle with a diameter of 18 mm is 81 π mm 2 . This is calculated by first finding the radius (9 mm) and then using the area formula A = π r 2 .
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