A. diameter, d = 2rd = 2r the formula using function notation is ; the value when r = 5r = 5 is ; the diameter of the circle is feet when the radius is feet. b. area, a = πr2a = πr2 the formula using function notation is ; the value when r = 5r = 5 is ; the area of the circle is feet when the radius is feet. c. circumference c = 2πrc = 2πr the formula using function notation is ; the value when r = 5r = 5 is ; the circumference of the circle is feet when the radius is feet.

Given : The diameter of the circle = 2r , where r is the radius.

Function notation for diameter :

If the value of r= 5 feet

Then , the diameter of the circle is feet = 2(5) feet = 10 feet

Hence,  the diameter of the circle is 10 feet when the radius is 5 feet.

Also, area of circle : , where r is the radius .

Function notation for area :

For r= 5 feet

Hence, The area of the circle is square feet when the radius is 5 feet.

Also, the circumference of circle =

Function notation for circumference =

For r= 5 feet

Hence, The circumference of the circle is feet when the radius is feet.

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