A circle has a radius of 30 cm. What is that circumference of the circle?

C = 60pi cm or approximately 188.4 cm

Step-by-step explanation:

The circumference of a circle is given by

C = 2 * pi *r

C = 2* pi * 30

C = 60 pi

We can approximate pi by 3.14

C  is approximately 60*3.14 or 188.4

(2x + 16) + (x) = 180

step-by-step explanation:

given,

abcd is a quadrilateral inscribed in a circle

angle a is labeled x plus 16, (x + 16)

angle b is labeled x degrees, (x)

angle c is labeled 6x minus 4, (6x – 4)

angle d is labeled 2x plus 16, (2x + 16)

what equation can be used to solve for angle b?

we know that the sum of the opposite angles of a simple quadrilateral inscribed in a circle is 180 degrees.

angle b is opposite angle d

therefore, angle b + angle d = 180

(x) + (2x + 16) = 180 

same as (2x + 16) + (x) = 180