- #1

PsychonautQQ

- 784

- 10

## Homework Statement

r=7sin(∅)

find the center of the circle in Cartesian coordinates and the radius of the circle

## The Attempt at a Solution

My math teacher is impossible to understand >.< and then the stupid homework is online and crap blah this class but I REALLY want to understand the material well.. anyway done venting to earn your pity but I REALLY don't know how to do this one and I locked my textbook in my car lol but since I know that isn't acceptable on physics forums I will try >.<

Okay I really don't know.. maybe I shouldn't have started this thread yet... I'll go research online and edit this post soon if anyone wants to be cool and post hints even though I'm breaking the rules that'd be cool.

my attempt:

r=7sin(∅)

x=rcos(∅)

y=rsin(∅)

x^2 + y^2 = r^2

plugging r into the x and y equations and squaring...

49(sin^2(∅)*cos^2(∅)) + 49sin^4(∅) = 49sin^2(∅)

(sin^2(∅)*cos^2(∅)) + sin^4(∅) = sin^2(∅)

cos^2(∅) + sin^2 (∅) = 1

is what that reduces to... alright sooo that's kind of cool I accidently did that but I got no closer to finding the center.. lol ;-/

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