What is the circumference of this circle equal to?

C = 2(pi)r = (pi)d

What is the area of this circle?

A = (pi) r^{2}

Find the area of this circle.

A = (pi)*36

Find the circumference of this circle.

C = 12(pi)

What is the arc measure, in degrees?

a^{o}

What is the arc length?

arc length = ^{a}/_{360} (2)(pi)r =
^{a}/_{360} (pi)d

If AB = 12 and BC = 5, what equation can you use to find the diameter, d?

5^{2} + 12^{2} = d^{2}

What is the correct equation to find x, if x is the length of AC?

5^{2} + 8^{2} = x^{2}

What is the arc measure of the intercepted arc?

2x^{o}

What is the measure of <a?

a = ^{1}/_{2} (y - x)

Find x.

x = 60^{o}

Find x.

x = ^{1}/_{2} (80 - 20) = ^{1}/_{2}
(60) = 30

What is the correct equation to solve for *
a*?

12a = 8(10)

What is the correct equation to solve for *
x*
?

18(x + 18) = 16(16 + 24)

What is the equation for this circle?

(x - h)^{2} + (y - k)^{2} = r^{2}

What is the equation for this circle?

(x - 4)^{2} + (y + 2)^{2} = 16