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3 years ago

Transform the Cartesian (rectangular) equation to a polar equation: x = -9. The selected answer is incorrect.

Mathematics

1 answer:

nika2105 [10]3 years ago

6 0

Answer:

Solution : Option C

Step-by-step explanation:

We have the equations r² = x² + y², x = r cos(θ), and y = r sin(θ) that can be used to solve this problem. In this case we only need the second two equations ( x = r cos(θ), and y = r sin(θ) ) as we don't need to apply the concept of circles etc here.

Given : x = - 9,

( Substitute r cos(θ) for x )

r cos(θ) = - 9,

r = - 9 / cos(θ)

( Remember that sec is the reciprocal of cos(θ). Substitute sec for 1 / cos(θ) )

r = - 9 sec(θ)

Therefore the third option is the correct solution.

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Step-by-step explanation:

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3 years ago

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2 years ago

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algol13

Given:

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To find:

The measure of arc RS.

Solution:

PQ and PT are secants intersect outside a circle.

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$$\Rightarrow 2 \times 54 = 2 \times \frac{1}{2} (220- m \ ar (RS ))$

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3 years ago

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