Sine, cosine rules for Edexcel A-level Maths
This page covers the following topics:
1. Sine rule
2. Problems with sine rule
3. Cosine rule
4. Problems with cosine rule
When solving word problems with the sine rule it is best to draw a picture and label the known angles/side lengths.
When solving word problems with the cosine rule it is best to draw a picture and label the known angles/side lengths.
Use the cosine rule to find angle A, given a = 5, b = 7 and c = 6.
Find the length of pole A. Give your answer with two decimal places.
The diagram shows a ladder propped against a slightly slanted wall. Find the angle between the ladder and the wall.
A triangle is created using 3 poles. The poles are 20 m, 25 m and 23 m in length. Find the angle between the 20 m and 23 m poles.
Two match sticks are held up with their tips against each other. Both match sticks are 5 cm long. The angle between them is 65º. Find the distance between the bottom of the match sticks along the ground.
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