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Geometry Honor Finals Formulas
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Gravity
Key Concepts:
Terms in this set (15)
Midsegment Theorem
Midsegment = 1/2Base
Concurrency of Median of a Triangle
AB= 2/3AC
AA Similarity Postulate
Angle A = Angle D and Angle B = Angle E then Triangle ABC = Triangle DEF
SSS Similarity Postulate
If AB/DE = BC/EF = AC/DF then Triangle ABC = Triangle DEF
SAS Similarity Postulate
If Angle A = Angle D and AB/DE = AC/DF then Triangle ABC = Triangle DEF
Pythagorean Theorum
c2 = a2 + b2
Geometric Mean (Altitude)
(With triangle ABC and right triangle ACD) BD/CD = CD/AD
Geometric Mean (Leg)
(With triangle ABC and right triangle ACD) AB/AC = AC/AD
45-45-90 Triangle
Hypotenuse = leg x square root 2
36-60-90 Triangle
Hypotenuse = smaller leg x 2
Longer leg = smaller leg x square root 3
Tangent
Tan = Length of leg opposite angle/Length of leg adjacent to angle
Sine
Sin = Length of leg opposite/Length of hypotenuse
Cosine
Cos = Length of leg adjacent to angle/Length of hypotenuse
Polygon Interior Angle Theorem
measure of all angle = (n - 2) x 180
Measure of an Inscribed Angle Theorem
Angle ADB = 1/2 arcAB
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