Area = pi*152 square mm
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Area of the circle: pi*152 = 706.858 square mm to 3 decimal places
Diameter = 30cm so radius = 15 cm. Then Area = pi*r2 = 706.9 cm2
A circle is fully defined by just one measure - its radius or diameter or circumference of area. I am sure there cannot be a circle with two measures as in the question!
The circle around home plate generally measures 26 feet in diameter. This area is referred to as the home plate area.
The area of a circle with a diameter of 9.4 m is: 69.4 m2