Unit 8.4
Perimeter And Area In The Coordinate Plane
Standard:
GPE.7
Bellwork
1
ABCD is a square. The equation of line AB is y =  x + 2. Find the
Objective:
To find the
perimeter
and area of
rectangle
and
triangles.
equation of line BC given that the coordinate of C is (5, -6).
5
Example 1 A triangle in a coordinate plane has vertices P(-1, 1), Q(-1, 4), and
R(4, 4). Find the perimeter.
Checkpoint A triangle in a coordinate plane has vertices A(2, 2), B(2, 7), and C(7, 2).
Find the perimeter.
Example 2 A rectangle in a coordinate plane has vertices J(-6, 1), K(-3, 5), L(5, -1),
and M(2, -5). Find the area.
Checkpoint A rectangle in a coordinate plane has vertices A(2, -6) and D(14, -1). Find
the area if AB is 3 units.