Question

Will medal and Fan <3

Answer 1

do you know the formula for finding the area of a circle using diameter ?

Answer 2

Area of circle = \[\pi * d^2 / 4 \]where d is diameter of circle

Answer 3

go on google and find an area calculator :D

Answer 4

Area = \(\large \pi r^2\)

Answer 5

The radius (r) is half of the diameter. So if the diameter given is 28cm what would the radius be?

Answer 6

@rainbowswirl

Answer 7

@hartnn Do you think you could explain this to me all in one? Im super confused :(

Answer 8

so half would be 14

Answer 9

@jhonyy9

Answer 10

To calculate the area, you need to use the formula \(\text{Area} = \pi r^2\).

Since we are given the diameter, we need to find the radius to help us evaluate the formula for finding the area. The radius is always half of the diameter. Meaning that if my diameter was 4, for example, then my radius would be 2.

Answer 11

Do you understand that so far?

Answer 12

Okay, half is 14 @calculusxy

Answer 13

That's correct and so 14 would be your radius.

You can plug that into the formula now.
\(Area = \pi (14)^2\)

Since the question said to use 22/7 for \(\pi\), you would now have: \(\frac{22}{7}(14)^2 = Area\). Can you evaluate that?

Answer 14

I dont know how, could you show me? @calculusxy

Answer 15

Okay so 14^2 = 14 x 14 = 196
\(\large \frac{22}{7} \times \frac{196}{1}\)
Can you do that?

Answer 16

I got 616 @calculusxy

Answer 17

Me too

Answer 18

Is that it? @calculusxy

Answer 19

I think so. The answer should be \(616 \text{cm}^2\)