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# 11.2 Chapter summary

## 11.2 Chapter summary (EMA7G)

• We can define three trigonometric ratios for right-angled triangles: sine ($$\sin$$), cosine ($$\cos$$) and tangent ($$\tan$$).

• Trigonometry is used to help us solve problems in two dimensions that involve right-angled triangles, such as finding the height of a building.

• The angle of elevation is the angle formed by the line of sight and the horizontal plane for an object above the horizontal plane.

• The angle of depression is the angle formed by the line of sight and the horizontal plane for an object below the horizontal plane.

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