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Mathematics 7 Online
OpenStudy (ineedhelp10):

Help!

OpenStudy (ineedhelp10):

A rectangle is inscribed within a circle. The coordinates of the rectangle are (-8,3); (20,3); (-8,-5); and (20,-5). What is the area and circumference of the circle?

OpenStudy (ineedhelp10):

@dumbcow

OpenStudy (ineedhelp10):

@Hero

OpenStudy (ineedhelp10):

@Easyaspi314

OpenStudy (ineedhelp10):

@e.mccormick

OpenStudy (dumbcow):

|dw:1383093422005:dw| find radius of circle using pythagorean thm

OpenStudy (ineedhelp10):

Where did you get the 14 and 4 from?

OpenStudy (ineedhelp10):

@Compassionate

OpenStudy (dumbcow):

from the coordinates of rectangle you know the length=28 and width = 8

jigglypuff314 (jigglypuff314):

find the distance of the rectangle's diagonal which would be the circle's diameter |dw:1383093736115:dw|

OpenStudy (ineedhelp10):

Oh okay! Yeah I understand that part. And after that?

jigglypuff314 (jigglypuff314):

once you get the diameter half the diameter is the radius area of circle: pi * (radius)^2 circumference of circle: pi * diameter

OpenStudy (ineedhelp10):

And how can I find the diameter of this figure?

jigglypuff314 (jigglypuff314):

the diameter is the distance from point (-8,3) to point (20,-5)

jigglypuff314 (jigglypuff314):

|dw:1383094324729:dw|

OpenStudy (ineedhelp10):

Would I need to sorta figure out the slope to get the diameter?

jigglypuff314 (jigglypuff314):

distance formula is: \[\sqrt{(x _{2}-x _{1})^{2}+(y _{2}-y _{1})^{2}}\] when given the points (x1, y1) and (x2, y2) so plug in for x2 = 20 , x1 = -8 , y2 = -5 , y1 = 3

OpenStudy (ineedhelp10):

Give me a min to try to solve it please

OpenStudy (ineedhelp10):

Is it 29.12 @jigglypuff314 ?

jigglypuff314 (jigglypuff314):

it would be best to keep it with square roots and stuff :)

OpenStudy (ineedhelp10):

so then it'll be like 784^2 and -8^2

jigglypuff314 (jigglypuff314):

the diameter would be √848

OpenStudy (ineedhelp10):

Oh okay that's what I got

jigglypuff314 (jigglypuff314):

so area would be pi(√848)^2 = 848*pi

OpenStudy (ineedhelp10):

Then will that mean that the radius is 424 square root?

OpenStudy (ineedhelp10):

And what about the circumference?

OpenStudy (ineedhelp10):

@jigglypuff314

jigglypuff314 (jigglypuff314):

circumference would just be pi times diameter so pi * √848 which can be simplified to 4pi√53 if you want

OpenStudy (ineedhelp10):

For the area, isn't it suppose to be the radius and not the diameter?

jigglypuff314 (jigglypuff314):

oh right, sorry, yeah so then pi * (1/2 * √848)^2 pi * (1/2 * 2√212)^2 pi * (√212)^2 so 212pi

OpenStudy (ineedhelp10):

Why would you multiply by 1/2?

jigglypuff314 (jigglypuff314):

radius = 1/2 diameter

OpenStudy (ineedhelp10):

thanks

jigglypuff314 (jigglypuff314):

glad I could help :)

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