Back to: MATHEMATICS SS2

**Welcome to class! **

In today’s class, we will be talking about trigonometry. Enjoy the class!

**Trigonometry**

**Sine Rule for Acute and Obtuse Angled Triangle**

Consideration is given to other triangles than a right-angled triangle. The angles of any triangle are denoted by capital letters such as; A, B, C, while the sides are represented by small letters; a, b, c, respectively.

**Acute Triangle:** This is a type of triangle in which the angles are less than 90^{0}.

**Obtuse Triangle:** Is a type of triangle in which one of the angles is more than 90^{0} but less than 180^{0}.

**Deductive Proof of Sine Rule**

The sine rule is the same for an acute and obtuse angled triangle.

**Given:** Any triangle ABC (acute-angled or obtuse-angled triangle).

**General Evaluation**

- Calculate the smallest angle in the triangle PQR such that p = 7.92m, q= 15.9m and c= 8.44m.
- Calculate the length of the side opposite the given angle in ∆ XYZ given that x =13.1m, y = 24.2m and Z = 47.80.

In our next class, we will be talking about** Bearing and Distances.** We hope you enjoyed the class.

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Islamiyyah OlarindeCool👏