# from TRIANGLE to TRIGONOMETRY

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TRIANGLES LESSON 1 – In this lesson, you will be introduced to five common types of triangles: Isosceles, Equilateral, Right-angled, Scalene, and Right-angled Isosceles.

TRIANGLES LESSON 2 – In this lesson, you will be introduced to the magical number of triangles.

TRIANGLES LESSON 3 – In this lesson, we will be looking at the exterior angles of a triangle.

TRIANGLES LESSON 4 – In this lesson, we are  going to prove the exterior angles of a triangle rule.

TRIANGLES LESSON  5 – In this lesson, we will be looking at Isosceles Triangle.

TRIANGLES LESSON  6 – In this lesson, we will be looking at Pythagoras Theorem .

TRIANGLES LESSON  7 – In this lesson, we will be looking at Trigonometric Ratios.

TRIANGLES LESSON  8 – In this lesson, we will be looking at one of the special angle, 45 degrees, which is related to the ratios of trigonometry.

TRIANGLES LESSON  9 – In this lesson, we will be looking at one of the special angles, 30 degrees and 60 degrees, which are related to the ratios of trigonometry.

TRIANGLES LESSON  10 – In this lesson, I will show you how to use a calculator to find the ratios of trigonometry.

TRIANGLES LESSON  11 – In this lesson, I will go through the triangles that help with remembering the ratios of trigonometry.

TRIANGLES LESSON 12 – In this lesson, I will show you how to find the length of a side with one known angle and side (apart from the right angle) using the ratios of trigonometry.

TRIANGLES LESSON 13 – In this lesson, I will show you another example of finding the unknown sides by using the ratios of trigonometry.

TRIANGLES LESSON 14 – In this lesson, we are looking at the opposite of the ratios of trigonometry.

TRIANGLES LESSON 15 – In this lesson, we will try an example of the inverse of the ratios of trigonometry.

TRIANGLES LESSON 16 – In this lesson, we will try another example of the inverse of the ratios of trigonometry.

TRIANGLES LESSON 17 – In this lesson, we will try an example of a scalene triangle using the ratios of trigonometry.

TRIANGLES LESSON 18 – Your teacher may only tell you the sine rule, but in this lesson, we will develop the sine rule from scratch.

TRIANGLES LESSON 19 – In this lesson, we will be using the sine rule to find an unknown side of a triangle.

TRIANGLES LESSON 20 – In this lesson, we will be using the sine rule to find an unknown angle of a triangle.

TRIANGLES LESSON 21 – Your teacher may only tell you the cosine rule, but in this lesson, we will develop the cosine rule from scratch.

TRIANGLES LESSON 22 – In this lesson, we will do an example of the cosine rule.

TRIANGLES LESSON 23 – In this lesson, we will prove two very important identities.

TRIANGLES LESSON 24 – In this lesson, we will use the two identities from the last lesson to work out some expressions.

TRIANGLES LESSON 25 – In this lesson, we will prove an identity using the identities we already know.

TRIANGLES LESSON 26 – In this lesson, we will prove an identity using the identities we already know.

TRIANGLES LESSON 27 – In this lesson, we will be looking at the graph of sin(x).

TRIANGLES LESSON 28 – We will now look at the graph of cos(x).

TRIANGLES LESSON 29 – We will now look at the graph of tan(x).

TRIANGLES LESSON 30 – We will be looking at the reciprocals of the trigonometric ratios.

TRIANGLES LESSON 31 – We are looking at identities which involve the reciprocals of the trigonometric ratio.

TRIANGLES LESSON 32 – We will be looking at the units of radians and also how to convert radians to degrees.

TRIANGLES LESSON 33 – We will try some more examples of radians.

TRIANGLES LESSON 34 – We will use a calculator to calculate radian functions.

TRIANGLES LESSON 35a – We will prove the addition formula of trigonometry over 2 episodes.

TRIANGLES LESSON 35b – We will prove the addition formula of trigonometry over 2 episodes.

TRIANGLES LESSON 36 – We will look at some examples of the additon formulae.