Question

Really stuck on this one here!

What is the approximate area of the output piston if the diameter is 1.4 m? Use the formula: A = π r2.

Answer 1

well when its a diameter that means you divide it by 2 so if the diameter was 4 then u would divide it by 2 and get 2, you get it @42cookiethere

Answer 2

radius is diameter/2
work from that :)

Answer 3

The diametre is usually 2 x the radius.

In this case, your radius is 0.7m

Answer 4

use the formula: pi=3.14. r=1/2*1.4=0.7
substitue: A=0.7*0.7*3.14=?

Answer 5

okay ummm...I have no idea, haha! sorry this stuff is mind boggling for me!

Answer 6

so if the diameter is 1.4 then u divide by 2 and get 0.7 then b.c its says r^@ you multiply it by itself and get 0.49 so R=? what @42cookiethere

Answer 7

2 by 2 almost like algbra x variable

Answer 8

you get it @42cookiethere

Answer 9

if you plug it in the formula like this
\[A=\pi 1.4 ^{2}\]
so if you plug it in u get

Answer 10

I don't get it!!!!! ahhh!

Answer 11

so you divide 1.4/2 what do u get @42cookiethere

Answer 12

OMG 0.7! there! Thank you!

Answer 13

if it was radius then u dont divide,

so you plug it in

A=pi 0.7^2
so u multiply 0.7 *0.7 and then u multiply it with 3.14, what do u get

Answer 14

1.5386

Answer 15

Correct

Answer 16

see you did it :D

Answer 17

Phew! thankyou! sorry, I just got impatient! haha! thanks!

Answer 18

anytime