All Precalculus Resources
Example Questions
Example Question #21 : Convert Polar Equations To Rectangular Form And Vice Versa
Write the equation for in rectangular form
First multiply both sides by cosine
Now we can make the substitutions and
add 2 to both sides
square both sides
multiply both sides by the denominator
distribute on the left side
subtract from both sides
factor out y squared
divide both sides by
take the square root
Example Question #21 : Convert Polar Equations To Rectangular Form And Vice Versa
Which is equivalent to in rectangular form?
Multiply both sides by r squared
Now we can substitute and
square both sides
Example Question #23 : Convert Polar Equations To Rectangular Form And Vice Versa
Which is equivalent to in rectangular form?
First multiply both sides by r:
Now make the substitutions and :
add to both sides
subtract x squared and y squared from both sides
square both sides
Example Question #21 : Polar Coordinates
Write in rectangular form
multiply both sides by r:
Now we can make the substitutions , , and :
If we subtract the terms on the right from both sides, we can complete the square twice and make this into a regular circle equation:
To complete the square for x, add 1, since .
To complete the square for y, add since .
re-write the left side as binomials squared:
Example Question #22 : Convert Polar Equations To Rectangular Form And Vice Versa
Write the equation for in rectangular form.
Multiply both sides by r:
Now we can substitute in , , and .
if we subtract both terms on the right from both sides, we can complete the square twice to get this into the normal form for a circle.
To complete the square for x, add 1 to both sides, since
To complete the square for y, add 16 to both sides, since :
Re-write the left side as two binomials squared
Example Question #23 : Convert Polar Equations To Rectangular Form And Vice Versa
Write the equation for in rectangular form
To convert, make the substitutions and :
square both sides
multiply both sides by
subtract from both sides
subtract from both sides
factor our
divide both sides by
take the square root of both sides
Example Question #22 : Polar Coordinates
Convert the equation to rectangular form
Multiply both sides by :
distribute
multiply both sides by r
convert to rectangular by making the substitutions , , and :
subtract 8x from both sides and combine like terms
complete the square for x by adding 16 to both sides
divide both sides by 16
Example Question #91 : Polar Coordinates And Complex Numbers
Convert to polar coordinates.
Write the Cartesian to polar conversion formulas.
Substitute the coordinate point to the equations and solve for .
Since is located in between the first and second quadrant, this is the correct angle.
Therefore, the answer is .
Example Question #92 : Polar Coordinates And Complex Numbers
Convert to polar form.
Write the Cartesian to polar conversion formulas.
Substitute the coordinate point to the equations to find .
Since is not located in between the first quadrant, this is not the correct angle. The correct location of this coordinate is in the third quadrant. Add radians to get the correct angle.
Therefore, the answer is .
Example Question #23 : Convert Polar Equations To Rectangular Form And Vice Versa
Convert the rectangular equation to polar form:
Because and , substitute those values in the rectangular form.
Now, expand the equation.
Subtract from both sides.
Recall the trigonometric identity
Factor the equation.
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