Download Top 21 Things to Know for the Geometry EOC Geometry Top 21

TOP 21
Things to Know
For the Washington State
GEOMETRY EOC
#21 “Green” vs. “Yellow”
Green Concepts will be on the test and will be part of your score!
Yellow Concepts will be on the test and will NOT BE PART OF YOUR SCORE!
Do not let them bother you.
They include the following:
Volume and surface areas of 3d figures (Cones, Spheres, Trapezoids, etc.)
Compass and Straight Edge Constructions
Circle Stuff - Circle Equations, Secants, Radii, Tangents, Chords.
#20 Classifying Triangles
“Icicles
Are
Isosceles”
Think of “Obese”
#19 Triangle Exterior Angle Rule
140° (Exterior)
40° (Remote Interior)
(Remote
Interior)
100°
#18 The 3 Triangle Segments
Midsegment
Connects side bisectors,
½ opposite side
Median
Connects vertex and side bisector
(broken into 1/3, 2/3 by centroid)
Altitude
Connects vertex to opposite side at a right
angle.
#17 Similar Triangles
~
#16 Polygon Angle Rules
#15 Converse, Inverse, Contrapositive
Converse - Switch if and then
Inverse – Negate both
Contrapositive – Switch and negate both
#14 Triangle Inequalities
Compared to 2 sides, a 3rd Side must be:
LSGD: The
Less than the Sum
3 side is
“Less
Greater than the Difference
Good”
rd
#13 Triangle Congruency Proofs
Look for and Use:
Shared Sides and Angles (Reflexive Property).
Vertical Angles (Vertical Angles are ≅).
#12 Pythagorean Theorem
The “C” is the
biggest side
#11 Sides and Angles of Triangle
Biggest Angle opposite Biggest Side
Smallest Angles opposite smallest side
#10 Is it a Right Triangle?
#9 Coordinate Formulas
Square root
of the
Squares of
the
differences
The average
or halfway
points
between the
values
#8 SOH-CAH-TOA (Trig Functions)
“Some Old Hag Cracked All Her Teeth On Apples”
#7 Symbols
#6 Coverting between Units
Linear (Like in lengths) Use ratio as is
Square (Like in area) Square ratio first
Cubic (like in volume) Cube ratio first
Example
3 feet = 1 yard
9 feet = 1 square yard
27 feet = 1 cubic yard
#5 Significant Digits
Zeros only count if they are between non zeros.
Leading or Trailing Zeros don’t count.
.00003 Degree of Precision = 1
1.0003 Degree of Precision = 5
1.2334 Degree of Precision = 5
3 x 107 Degree of Precision = 1 (the 𝑧𝑒𝑟𝑜𝑠 𝑖𝑛 107 𝑑𝑜𝑛′𝑡 𝑐𝑜𝑢𝑛𝑡)
#4 Minimum/Maximums
Because of rounding the degree of accuracy is half a unit
each side of the unit of measure.
Example: Paul measured his bedroom as 10 feet long and
12 feet wide.
What is the minimum and maximum area of his bedroom?
Use 9.5 x 11.5 to get the minimum of 109.25 sq. ft.
Use 10.5x 12.5 to get the maximum of 131.25 sq ft.
-1
#3 Use to Find Angles
If you know the trig ratio but not the angle, Use the
corresponding -1 button to find the angle measure.
(Push 2nd button 1st)
#2 Quadrilateral Properties
#1 Four Points of ∆ Concurrency