Polar Coordinates and Trigonometric Functions

The video tutorial explains how to convert Cartesian coordinates (4, 6) to polar coordinates (R, θ). It begins by plotting the point on a coordinate plane and sketching a reference triangle. The Pythagorean theorem is used to calculate R, the distance from the origin to the point. The square root of 52 is simplified using prime factorization. Theta is calculated using the arctangent of the ratio of y to x, with a calculator ensuring the angle is in radians. The final polar coordinates are presented as (2√13, 0.9828).

What is the range of theta in polar coordinates as mentioned in the introduction?

• 0 to 2π radians

• 0 to π radians

• -π to π radians

• -2π to 2π radians

When plotting the point (4, 6) on the coordinate plane, how many units do you move up from the origin?

• 2 units

• 10 units

• 6 units

• 4 units

Which theorem is used to calculate the distance R in polar coordinates?

• Pythagorean theorem

• Sine rule

• Cosine rule

• Tangent rule

What is the formula for calculating R using the Pythagorean theorem?

• R = x + y

• R = x^2 + y^2

• R = √(x^2 + y^2)

• R = x^2 - y^2

What is the range of the arctangent function used to calculate theta?

• 0 to π

• -π/2 to π/2

• 0 to 2π

• -π to π

How do you calculate theta using the arctangent function?

• theta = arctan(x/y)

• theta = arctan(y/x)

• theta = arctan(x^2 + y^2)

• theta = arctan(x - y)

What is the simplified form of the square root of 52?

• 2√13

• 4√13

• √26

• √52

In which mode should the calculator be set to ensure correct angle calculations?

• Gradian mode

• Degree mode

• Radian mode

• Decimal mode

What are the final polar coordinates for the Cartesian point (4, 6)?

• (4√13, 1.9828)

• (4√13, 0.9828)

• (2√13, 1.9828)

• (2√13, 0.9828)

Why is it important to ensure the angle is in the first quadrant when using arctangent?

• To ensure the angle is positive

• To ensure the angle is negative

• To ensure the angle is within the range of arctangent

• To ensure the angle is zero