Trigonometry

Trigonometry Historical facts

• Discovered in 140 BC
• Created by Hipparchus
•  Trigonometry is a part of elementary math
• dealing with angles triangles and 
• trigonometric functions such as sine

Hipparchus of Nicaea, was a Greek astronomer, geographer, and mathematician of the Hellenistic period. He is considered the founder of trigonometry

"Ancient Greek and Hellenistic mathematicians made use of the chord. Given a circle and an arc on the circle, the chord is the line that subtends the arc. A chord's perpendicular bisector passes through the center of the circle and bisects the angle. One half of the bisected chord is the sine of one half the bisected angle."

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