Calculate the circumference of a circle with diameter 5 cm. Round to 2 d. p.

15.71 cm

Step-by-step explanation:

Equation for the circumference of a circle: 2πr or dπ where r is the radius & d is the diameter.

5*π = 15.71

15.71 cm

Step-by-step explanation:

Use the circumference formula, C = 2r

Since the radius of half of the diameter, the radius will be 2.5 cm

Plug in the radius into the formula and solve:

C = 2r

C = 2(2.5)

C = 15.71

So, the circumference of the circle is approximately 15.71 cm

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!