The formula for area is πr². Radius is circle \( \frac{diameter}{2} \):

r = \( \frac{d}{2} \)
r = \( \frac{6}{2} \)
r = 3
a = πr²
a = π(3²)
a = 9π

You need to find the value of c so solve the first equation in terms of x:

-9c + x = 2
x = 2 + 9c

then substitute the result (2 - -9c) into the second equation:

-2c - 2(2 + 9c) = -5
-2c + (-2 x 2) + (-2 x 9c) = -5
-2c - 4 - 18c = -5
-2c - 18c = -5 + 4
-20c = -1
c = \( \frac{-1}{-20} \)
c = \(\frac{1}{20}\)

An exterior angle of a triangle is equal to the sum of the two interior angles that are opposite:

d° = b° + c°

To find angle c, remember that the sum of the interior angles of a triangle is 180°:

180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 57° - 35° = 88°

So, d° = 35° + 88° = 123°

A shortcut to get this answer is to remember that angles around a line add up to 180°:

a° + d° = 180°
d° = 180° - a°
d° = 180° - 57° = 123°

A trapezoid is a quadrilateral with one set of parallel sides.

A monomial contains one term, a binomial contains two terms, and a polynomial contains more than two terms.