Question

can someone check my answer?

Answer 1

ill try if i know how to do it

Answer 2

yup...thts correct

Answer 3

r u sure?

Answer 4

sorry ....it would be \[\pi r + 2r\]
mt bad..:((

Answer 5

*my

Answer 6

3.14 * r + 2 r huh?

Answer 7

@jim_thompson5910

Answer 8

http://www.mathopenref.com/semicircle.html

Answer 9

im now confused but thanks

Answer 10

Perimeter of a semi circle: \(P = \dfrac{1}{2}\pi d\)

Answer 11

So if the radius is given,just double it.

Answer 12

\[d=2r\]

Answer 13

\[P = =\dfrac{1}{2}\pi (2r)\]

Answer 14

huh so its 12

Answer 15

An alternative definition of a semicircle is that it is simply an arc - a curved line that is half the circumference of a circle, without the straight line linking its ends.

Answer 16

so what do i multiply?

Answer 17

do u hav a given figure???

Answer 18

what do u mean?

Answer 19

is it 12? i dont know how to round it

Answer 20

to solve your question think of it like this:

Step 1: Find the circumference of the full circle using C = pi*d
[ note: pi = 3.14 and your d= radius * 2 = 6*2 = ?]

Step 2: Divide the circumference in half (since we are working with a semi-circle)
[note: this is the length of the curvy part of the semi-circle]

Step 3 : Add the diameter (Since we've found the curvy part, we need to add the diameter to get the FULL circumference of the semi circle)

Answer 21

see its not mentioned whether its closed semicircle or open semicircle.....
so u gotta consider it open......so u r correct....

Answer 22

it says approximate in hundreths

Answer 23

approximate in hundredths means to round off to 2 decimal places

Answer 24

i dont even know

Answer 25

it depends if the question is asking for the full perimeter of the semi circle or just the perimeter of the curvy side... i'd say that the question is asking for the FULL perimeter meaning since you found that the area of the curvy side = 18.84
We have to add the diameter = radius * 2 = 6*2 = 12.
So add the curvy side + the diameter = full perimeter of a semi circle.

Answer 26

@butterflydreamer hey its not mentioned whether its open or closed....so whts the need of just adding the diameter....

Answer 27

18.84 +12?

Answer 28

hmm this question isn't very clear..
it does say perimeter though.. and perimeter is the full outline of a shape..?
So it would be closed would it not? O_O

Answer 29

no if its not mentioned then we gotta consider it open....so no need to add diameter....

Answer 30

i dont really know it says approximate the perimeter of a semi circle

Answer 31

really? :O @rishavraj
Well in that case, we won't add the diameter then.
If we don't add the diameter than 18.84 will be your final answer to the nearest hundreth .

Answer 32

well thank u all of u im posting more to be checked but they are complicated