TOP 21 Things to KnowFor the Washington

StateGEOMETRY 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 ConstructionsCircle Stuff - Circle Equations, Secants, Radii, Tangents, Chords.

#20 Classifying Triangles

Think of “Obese”

“Icicles Are

Isosceles”

#19 Triangle Exterior Angle Rule

140

40 (Remote Interior) (Remote Interior) 100

#18 The 3 Triangle SegmentsMidsegment

Connects side bisectors, ½ opposite side

MedianConnects 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

𝑆𝑖𝑚𝑖𝑙𝑎𝑟

#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: Less than the Sum Greater than the Difference

LSGD: The 3rd side is

“LessGood”

#13 Triangle Congruency ProofsLook 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 SideSmallest Angles opposite smallest side

#10 Is it a Right Triangle?

#9 Coordinate Formulas

The average or halfway

points between the

values

Square root of the

Squares of the

differences

#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 isSquare (Like in area) Square ratio firstCubic (like in volume) Cube ratio first

Example3 feet = 1 yard9 feet = 1 square yard27 feet = 1 cubic yard

#5 Significant DigitsZeros only count if they are between non zeros.Leading or Trailing Zeros don’t count.

.00003 Degree of Precision = 11.0003 Degree of Precision = 51.2334 Degree of Precision = 53 x Degree of Precision = 1 (the

#4 Minimum/MaximumsBecause 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.

#3 Use -1 to Find AnglesIf 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