Sine Rule | Trigonometry | Maths | FuseSchool

In this video we are going to discover what the sine rule is and how it works.

For right angle triangles, we can use Pythagoras and SOHCAHTOA to find missing sides and missing angles. However, not every triangle is a right-angle triangle.

For non-right angle triangles we have the sine rule and the cosine rule.

The sine rule can be used to find either missing sides or missing angles in any triangle (right angle or not). The sine rule is based on opposite pairs - an angle and the opposite side. We therefore label sides as a, b and c, and angles as A, B and C. We can then simply substitute in the values to find the missing side or the missing angle.

If we're looking for a missing side, we use the formula (a / sinA) = (b / sinB).

Whereas to find a missing angle we use (sinA / a) = (sinB / b).

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[thaisribeiro]

best educational channel I've come across in a while. thank you

[sheikhdubai]

Have been failing almost every sine and cosine rule previous year until i came here, thanks a lot

[zoobloo]

nice and clear ! woo! Also cool animations, what program did you use for them?

[jjmc]

Omg this was so much more easier and clear thanks so much🤧😭

[danielthomas]

Thanks for the helpful vid. I am just doing some quick revision before my mocks.

[sof]

A really nice and clear video, thanks a lot!

[sthivyan]

wow wow
thank you so much.its so helpful me

[zaraah]

Do we not use SOH CAH TOA in trigonometry? She said it’s used it Pythagoras ???

[luganomwakibete]

THANK YOU SO MUCH VERY HELPFUL AND INSPIRING

[derekokeoghene]

Thanks for making some rule clear for me today😌

[simirkaur]

Why are the formulas of missing side and missing angle different?

[Khushi-pxpy]

i still didn't get the right answer, how come...wht did i do wrong?

[Felistus-jvgq]

Sohcahtoa only applies in right angles

[vriis]

That second Sin rule gives me 1.25248382

[blairjacksonmusic]

You look like my girlfriend if she was smart