4. Trigonometric Ratios

4.01 Review of trigonometry for right-angled triangles

4.02 Angles of inclination

4.03 The sine rule

4.04 The cosine rule

4.05 Further problem solving with trigonometry

4.06 Area of a non-right-angled triangle

Year 11

4.06 Area of a non-right-angled triangle

Interactive practice questions

Calculate the area of the following triangle.

Round your answer to two decimal places.

A triangle is depicted with the measurements of its two sides and their included angle. The included angle, highlighted by a blue-shaded arc, measures $50^\circ$50° and is adjacent to sides measuring $12$12 m and $13.1$13.1 m.

Easy

2min

Calculate the area of the following triangle.

Round your answer to two decimal places.

Easy

1min

Calculate the area of the triangle.

Round your answer to two decimal places.

Easy

< 1min

Calculate the area of the triangle.

Round your answer to two decimal places.

Easy

< 1min

Outcomes

1.2.4

establish and use the sine and cosine rules, including consideration of the ambiguous case and the formula Area=1/2 bc sin⁡A for the area of a triangle

What is Mathspace

About Mathspace