1. Megan Larson, Eric Echard, Nicholas Spry
AMTNYS
2009
Unsolved Mysteries
Trig Functions
Megan Larson, Eric Echard, Nicholas Spry

2. I saw the Sine Jya Abbreviated form of “Jya-ardha” meaning“Chord-half”
Jiba/Jb
Phonetic translation in Arabic
Jaib
Meaning “cove” or “bay”
Sinus
Latin word for “cove” or “bay”
Sine: “the half-chord of the double of the central angle.”
- “Where in the Sine is a Chord?” by Robert Rogers

3. Cosine: “Complement’s sine”
What Goes Where?
Sine: “Half-chord”
Cosine: “Complement’s sine”
Tangent: “Tangere,” meaning “to touch” (Latin)
Secant: “Secare” meaning “to cut” (Latin)
Cotangent: Complements tangent
Radius
Cosecant: Complement of secant

4. Mysteries of Secant and Cosecant
sec(θ) tan(θ)
B E 1
Similar Triangles
by AAA F
sin(θ)
B C
cos(θ) θ □ □ θ □ θ □

5. Mysteries of Secant and Cosecant
Similar Triangles
by AAA
E cot (θ) H
csc(θ) B □ θ F
sin(θ)
B C
cos(θ) □ θ θ □ θ □

6. Check us out! If you like what you saw please take a copy of our lesson plan or feel free to contact us: Megan: Eric: Nick: