Area of a circle with a diameter of 63

That is a question about circle area.

To calculate the area of a circle, we multiplicate the constant pi () by the radius (of the circle) squared. The expression represents that is below:

In our problem, we don't know what is the circle raius, but we know the diameter. In a circle, the diameter is equal the double radius.

So, to know the radius of our circle, we divided the diameter by 2. Consequently, the raius of our circle is .

Now, we should use the expression and we will find the area:

Therefore, the area of a circle with a diameter of 63 is approximately 3115.665.

I hope I've helped. :D

Enjoy your studies! \o/

312312

step-by-step explanation:

answer: c, the green line

step-by-step explanation:

there is no black line, eliminate b.

simple interest implies periodic payments, but the red line shows no payments, eliminate d.

simple interest has equal payments. if paid say every day, the graph is about a straight line (actually a stairstep).

the yellow line is not straight, eliminate a.

check: the green line is straight, answer is c.

simple interest with positive interest rate gives a straight line sloping up to the right. green line:

g(t) = $100 + ($200-$100) ÷ (20 years) × (t years)

= $100 + (4%/year) × ($100)(t years)

incidentally, the yellow line curving upward represents continuously compounded interest

y = $100 × 2^(t years / (14 assuming the yellow line hits $200 at 14 years. 2^0 is 1, so y(0) = $100; 2^(14/14) is 2, so y(14) = $200.