1. Precalculus
9-1 Polar Coordinates
The __________________ coordinate system uses the distance from a fixed point (like
the ___________________) and the angle from a fixed _______________.
• The origin is called the __________________.
• The ______________________________ is the horizontal ray from the pole to
the right.
• A point P is identified by the
coordinates ______________.
• r is the ______________________
from the pole to the point.
• θ is the ________________ from
the
Graph the angle first, then find the distance
along that line.
7π
Example 1: Graph P(3, 60°), Q −1.5, , and R(-2, -135°).
8
There are _____________________ representations of (r, θ):
(r, θ + )
( , θ + (2k + 1)π) where k is any integer.
Polar Equations
A polar equation is in the form:
__________________________________________________________________
2. Basic graphs:
Example 2: Graph (a) r = 3 and
3p
(b) θ =
4
Distance Formula for the polar plane
If P1(r1, θ1) and P2(r2, θ2) are two points in the polar plane, then
P1P2 =
Example 3: While mapping out a level site, a land surveyor identifies a landmark that
is 700 feet away and 40° to the left, and another one 350 feet away and 35° to the right.
What is the distance between the landmarks?
HW p. 558 (16 – 26, 32 – 44 even)
