anonymous 5 years ago find the exact perimiter of the rectangle. then approximate your answer. square root 18cm and square root 72cm

1. anonymous

$\sqrt{18} and \sqrt{72}$

$2\sqrt{18}+2\sqrt{72}=6\sqrt{2}+6\sqrt{2}=12\sqrt{2}$

Any questions?

4. anonymous

ok I get

Good

6. anonymous

how do I get the approx?

7. anonymous

doesnt seem to work right I get 0

I would approximate the sq rt of 2 as 2.14 as it is an irrational value

excuse me 1.414 lol

10. anonymous

that doesnt seem right either it says 14 and it should be in the 100s?

The perimeter is approx 17

How do you figure in the 100s?

13. anonymous

ok

The sides are 4.3 cm and 8.5 cm add up the 4 sides for perimeter 8.6 +17=25.6 which is quite a bit diffrerent than 17.......thinking

I see the problem$2\sqrt{72}=12\sqrt{2}$ not 6 sq r2 2

$6\sqrt{2}+12\sqrt{2}=18\sqrt{2}$ thats more better.

That is the exact , the approximate is 25.45 cm

did you see where I goofed$2\sqrt{72}=2\sqrt{36}\sqrt{2}=12\sqrt{2}$

Is it clear now SaraJ?"

20. anonymous

Yes I was wondering why it wasnt comming out right, LoL