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\nSine Or Cosine Rule?\n

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\nNot every triangle is a right-angle triangle, so we can't always use Pythagoras and SOHCAHTOA to find missing sides and missing angles. We instead use the sine rule or the cosine rule. They can both be used to find either missing sides...\nNot every triangle is a right-angle triangle, so we can't always use Pythagoras and SOHCAHTOA to find missing sides and missing angles. We instead use the sine rule or the cosine rule. They can both be used to find either missing sides or missing angles in any triangle (right angle or not). We label the sides as a, b and c, and angles as A, B and C.

We need to work out whether to use the sine rule or the cosine rule.

The sine rule is easier, so look for that one first. The sine rule is based on opposite pairs: you need an angle and the side opposite it, then you need either an angle and you want the opposite side OR you need a side and you want the opposite angle.

If we don't have the right combination of sides and angles for the sine rule, then we can use the cosine rule. For the cosine rule, we either want all three sides and to be looking for an angle, OR we need to have a side, angle and side all next to each other, and to then be wanting to find the third side.\n
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Resource Details

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Educator Rating
Not yet Rated
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Media Length
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2:51
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Grade
6th - Higher Ed
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Subjects
Science
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Media Type
Instructional Videos
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Source:
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\nFuseSchool - Global Education\n\n
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Date
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2017
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Language
English
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Audiences
For Teacher Use
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Usage Permissions
Fine Print: Educational Use
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Concepts

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angles, sides, cosine, opposite, work, triangles, missing angles, pythagoras, right triangles
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Additional Tags

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maths, digital learning, online learning, learn maths, school maths, mathematics, gcse maths, high school maths, maths help, free online education, fuseschool, fuse school, sin, cos, tan, sohcahtoa, sine rule, cosine rule, right angle triangles, missing sides, click play, complete pair, sign rule, missing angle, missing side, half pair, angle triangle, rule, pair, sign, pairs, triangle, angle, half, side, video, find, pause, workout, answer, ready, check, works
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Classroom Considerations

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Best For: Explaining a topic
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