## How was trigonometry used in ancient times?

The ancient Greeks transformed trigonometry into an ordered science. Astronomy was the driving force behind advancements in trigonometry. Most of the early advancements in trigonometry were in spherical trigonometry mostly because of its application to astronomy.

**What are the rules for trigonometry?**

Answer: The trigonometric laws of identity comprise these significant reciprocal equalities. The tangent is the sine we divide by the cosine. The cotangent is equal to one over the tangent, or the cosine we divide by the sine. The secant is equal to one over the cosine and the cosecant is equal to one over the sine.

### What are the three trigonometry rules?

There are three primary trigonometric ratios sin, cos, and tan. The three other trigonometric ratios sec, cosec, and cot in trigonometry are the reciprocals of sin, cos, and tan respectively….

- a2 = b2 + c2 – 2bc·cosA.
- b2 = c2 + a2 – 2ca·cosB.
- c2 = a2 + b2 – 2ab·cosC.

**When was trigonometry first used?**

Trigonometry in the modern sense began with the Greeks. Hipparchus (c. 190–120 bce) was the first to construct a table of values for a trigonometric function.

#### Did the Egyptians use trigonometry?

In fact, the geometry the Egyptians used became a direct prelude to trigonometry. One example of the trigonometry that the Egyptians used can be found on the Rhind papyrus. The Rhind papyrus is a collection of mathematics problems dating back from around 1800 B.C.

**Did ancient Egyptians know trigonometry?**

Early study of triangles can be traced to the 2nd millennium BC, in Egyptian mathematics (Rhind Mathematical Papyrus) and Babylonian mathematics. Trigonometry was also prevalent in Kushite mathematics.

## When was trigonometry first taught in high school?

In the 11th and 12th grades, in the larger high schools of 1950, there were classes called “advanced algebra”, “solid geometry” and “trigonometry.” Though this much mathematics was never a requirement for admission to a university, “college preparatory” students who intended science or engineering careers would take …

**Who is called Father of trigonometry?**

The first known table of chords was produced by the Greek mathematician Hipparchus in about 140 BC. Although these tables have not survived, it is claimed that twelve books of tables of chords were written by Hipparchus. This makes Hipparchus the founder of trigonometry.

### Where did sin Cos Tan come from?

The functions sine and cosine can be traced to the functions jyā and koṭi-jyā, used in Indian astronomy during the Gupta period (Aryabhatiya and Surya Siddhanta), via translation from Sanskrit to Arabic, and then from Arabic to Latin.

**Where did Sin Cos Tan come from?**