What is the exact area of a circle whose diameter is 24 cm

The area formula of a circle is π× pi is 3.14 and r is the radius.  The question gives you the diameter.  To find the radius with a given diameter, divide the diameter by 2.  24÷2=12.  The radius is 12.  Now we can multiply 3.14× do the exponents first.  12×12=144.  Now multiply that by pi. 144×3.14=452.16

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