If the radius of a circle is 1ft, and the diameter is 2 ft., what is the circumference and area?

Question

do you use the 2*3.14*r formula?

Answer 1

Circumference

C = 2 π r

C = 2(3.141592654)(1)

C = 6.283185307

C = 6.28 Feet rounded to two decimal places

The answer is C - 6.28

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Area of a circle

A = π r²

A = 3.141592654 (1)²

A = 3.14 Squared feet. Rounded to two decimal places

The answer is A - 3.14

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Answer 2

the circumference is 2 x pi x radius or diameter x pi.
The area is pi x radius squared
pi is 3.14 when rounded off.
c = 2 x 3.14 x 1ft =6.28ft
a = 3.14 x 1ft^2 = 3.14 ft^2

Answer 3

Circumference=2(pi)r
=2(3.14)1
=6.28 ft
Area =(pi)r^2
=(3.14) 1^2
=3.14 Sq ft

Answer 4

The circumference would be 2 x pi or 6.28318530718.
The area would be pi because pi x r² = area
r is 1 and 1² is one so the answer is 3.14159265359

Answer 5

circumference=2pir=2*pi*1 foot
=2*3.14ft=6.28 foot
area=pir^2
=3.14*1^2=3.14 square foot
unless otherwise stated it is best to leave pi as pi

Answer 6

2 pi r. Yes you use that formula because pi=3.14159...
so 2pir=circumference so the circumference is 2 pi.
pi r squared is area so the area is just pi.

Answer 7

r x 2 = diameter. d= 2
2 x 3.14 = circumfrence
c= 6.28
that was too easy..... it shouldnt be a question.... very simple... too simple... oh well.... hope i answered most of your question.

Answer 8

constructor - accepts radius of circle as an argument: public Circle(double r) { radius = r; } constructor - no arg that sets radius field to 0.0 (replace your constructor with this) public Circle() { radius = 0; } And remove the "Circle r = new Circle();"

Answer 9

2(pi)r will give the circumference

2(pi)r^2 will give area