Substitution Method -
Steps to the Substitution Method
Step 1: Look for a variable to isolate.
Step 2: Isolate it! (Get it by itself.)
Step 3: Substitute into the OTHER equation.
Step 4: Solve for one variable.
Step 5: Plug answer back in to get other
var
Foundations of Geometry Chapter 8 Formulas
8.2 Angles in Polygons
Interior Angle Sum = 180(n 2)
Exterior Angle Sum = 360
8.3 Area of Squares and Rectangles
Area of a Square = s2
Area of a Rectangle = lw
8.4 Area of Triangles
Area of a Triangle = bh
8.5 Ar
CHAPTER 7: Similarity
7.4 Triangle Similarity SSS and SAS Similarity Postulates
In Lesson 7.3, we learned a shortcut to determine if two triangles are similar. The AA Postulate allowed us
to assume that two triangles were similar if we could find two pair
CHAPTER 6: Quadrilaterals
6.6 Reasoning About
Quadrilaterals
We have studied SIX types of special quadrilaterals in Chapter 6. The flowchart below depicts how all of
these special quadrilaterals are related. Each successive shape is a special example of t
CHAPTER 6: Quadrilaterals
6.4 Rhombuses, Rectangles
and Squares
Recall: A parallelogram is a four-sided figure (quadrilateral) with both pairs of
opposite sides parallel. Today we will study three special types of parallelograms:
(Square = combination of
CHAPTER 6: Quadrilaterals
6.3 Proving Parallelograms
This section is basically just an extension of lesson 6.2. In 6.2, you solved for
the missing sides and angles of a parallelogram. In this lesson, you are given all
the sides and angles so you can tell
CHAPTER~O: RIGHT TRIANGLES AND TRIGONOMETRY
Section Jo.2: Specia~ Right Triangles
45-45-90 Triangle Theorem
A 450-450-90 triangle is an isosceles right triangle,
where the hypotenuse is ~/~-times the ~ength of each ~eg.
the ~ength of the shorter leg and t
CHAPTER10:RightTrianglesand
Trigonometry
10.3SpecialRightTriangles
(306090)
YesterdaywelearnedthefirsttypeofspecialrighttriangleinGeometry,
calleda454590.Theruleforthistypeoftrianglewasasfollows:
leg
x
hypotenuse = (2)leg
45o
hypotenuse
x2
45o
leg x
Today