What is the circumference of a circle with a diameter of 12 cm use 3.14 for r !

C = 2πr or πd

Since the diameter is given, we will use C = πd.

C = π×12

C = 37.68 cm

The answer is C = 37.68  or    C ≈ 37.7

Circumference of a circle is found by using 2πr:

π = 3.14

diameter = 12      so          radius = 12/2 = 6cm

2×3.14×6

= 6.28×6

= 37.68

≈ 37.7

question 1 is 8, question 2 is 9, question 3 is 24

step-by-step explanation:

now, the numbers they give you at the top are the key. from there, you just have to plug and chug! let's try 1, 2, and 3!

key: a=3, b=5, c=6

1. a+5

remember, a=3, so we plug that in to get 3+5=8

2. 15-c

c=6, so we plug that in to get 15-6=9

3. 4b

b=6, so we plug it in to get 4*6=24

time to try the rest on your own! if you put the answers below in a comment, i'll check them for you!

step-by-step explanation:

use pothagarean therom

a^2+b^2=c^2 so first ac

acm is a right triangle because c= 90°

and am (the hypotenuse or c) =16+9 =25

but there is not enough info we need another angle or side length