Question

Given circle O, which of the following is a tangent of the circle?

Answer 1

hint: this is a tangent line:

Answer 2

although...i am just assuming that the question is given a circle and a few lines which one is the tangent line

Answer 3

yes it is thank you :) can you keep helping me?

Answer 4

is it still about this question?

Answer 5

no
different one now

Answer 6

Find the circumference and the area of a circle with radius of 7 ft. use pi=3.14 and round your answer to the nearest hundredth .

Answer 7

\[\text{circumference} = 2\pi r\]
\[\text{area} = \pi r^2\]

Answer 8

ok thanks hold on ill be right back let me just do this question so we can move on to the next one

Answer 9

sure

Answer 10

just tag me when you're ready

Answer 11

Ok What is the diameter of a circle with the area 49pi in^2?

Answer 12

do you know how to find the radius of that?

Answer 13

No :/

Answer 14

\[r = \sqrt{\frac A\pi}\]
then \[d = 2r\]
does that help?

Answer 15

i think soo, so do i just plug in for d?

Answer 16

yup

Answer 17

so then what do i plug in for the r?

Answer 18

7 right? or nothing?

Answer 19

hmm close.. 7 is just r..the radius

Answer 20

now multiply by 2 to get the diameter

Answer 21

so 49 for D and 7 for R right? lol sorry im really dumb in math

Answer 22

no no... \[r = \sqrt{\frac A\pi}\]
\[r = \sqrt{\frac{49 \pi}{\pi}}\]
\[r = \sqrt{49}\]
\[r = 7\]
^that's just the radius

to get d (diameter)
\[d = 2r\]
\[d = 2\times 7\]

Answer 23

Ohh ohhh ok so the diameter is 14 :)

Answer 24

yup

Answer 25

ok cool next ummm

Answer 26

you see i cant draw because it isnt accurate :./

Answer 27

omg -__-

Answer 28

find the S.A of a sphere with the radius of 2.5cm

Answer 29

\[S.A = 4\pi r^2\]

Answer 30

^that's for a sphere

Answer 31

ok i got the answer Ok how do i find the S.A and Volume for a Cylinder?

Answer 32

\[SA = 2\pi r^2 + 2\pi rh\]
\[V = \pi r^2 h\]

Answer 33

uhmm okay...i need to go now so good luck

Answer 34

oh man really thanks for your help :)