CSEC Maths - Sine Rule and Cosine Rule

[@janellejohnson5750]

You could use ASS ( Angle, Side, Side ) and SSS ( Side, Side, Side ) to remember the Cosine rule

[@darkwolf5717]

😂😂

[@Verse.Tech.]

You don't know how much you've helped me thank you so much

[@arsenetazzyje6271]

This is so insightful... I wish you would make a circle theorem video.... I would really like you to explain the rules of circle theorem

[@CSECMathematics]

That was one of my next topics to cover. I just don't have the time right now though.

[@alphamorgan3403]

These note are very helpful towards my examination in MAY thank.😇

[@tiffanybedward1456]

Thank you, sir! I really appreciate your videos. They have helped me tremendously. ..

[@CSECMathematics]

You are very welcome

[@chemekacampbell4863]

Thank you

[@ayannalewis8470]

We have a triangle this is not drawn to scale this just a sketch x. 40° and 60° find x which is a/sin A =b/sinB = ×sin60°=8/sinB=×/0.866 cross multiply 8/0.643= 0.643= 8×0.866× 8×0.866/0.634= x=1

[@ayannalewis8470]

Find 0 a/sinA=b/sinB=6/sin0=9.2/sin120°=6/sin0cross multiply 9.2/0.866= 9.2sin0=0.866×6=>sin0=0.866×6/9.2 = sin0=0.565 =0 sin (0.565)=0=34.4

[@melissasingh5294]

Well explained...thank you soo much....

[@CSECMathematics]

+Melissa Singh According to CXC students have great difficulty with this. They don't know when to use the sine rule or cosine rule and when to use sine ratio, cosine ratio or tangent ratio. Remember this Use the sine, cosine and and tangent ratios when the triangle is a right angled (90 degrees) triangle. If the triangle is right angled you can identify the opposite, adjacent and hypotenuse sides. Use the cosine rule when 1. You are given all three sides and no angles. 2. You are given two sides and the angle between the given sides. Use the sine rule when you 1. You have two sides and an angle that is opposite to one of the known sides. 2. You are given two angles and one side and you are asked to find a side opposite to one of the angles.

[@melissasingh5294]

Thanks so much I actually took note of this in your video...

[@shanmack5022]

you saved my life omg...thank you

[@WandHaven]

So in simple terms to utilize the Sine Rule when there's more than one Angle in a triangle

[@ayannalewis8470]

This is a right angel triangle 9.2cm, 6cm, 120°(0)

[@ayannalewis8470]

Find x when do we used cosine rule ywe use cosine we have three sides and a angle or two side and angle

[@ayannalewis8470]

Afternoon sir

[@isiahmoses559]

Thank you for the explanation. The csec mathematics trigonometry is utter fuckery l. (I know I should change my mindeet)

[@priyaseedath6848]

Thank youuu

[@ayannalewis8470]

a/sinA=c/sinC= a/sinA= C/sinC

[@ayannalewis8470]

Sine Rule a/sina =b/sin b =C/sin c

[@ayannalewis8470]

Sine Rule = a/sinA =b/sinB=c/sinC

[@ameekaqueeley6582]

what app is used to draw the triangles and problems in the video?

[@CSECMathematics]

I'm using a digital pen and tablet when I'm teaching

[@ayannalewis8470]

Good morning sir

[@dTallest]

Go live and do past papers for January students please 2023🥲

[@ayannalewis8470]

X = 10.8cm

[@lidoncarter1492]

Good evening sir, isn't sine rule Sin A/ a = Sin B/ b= Sin C/c

[@lidoncarter1492]

Or it doesnt matter?

[@CSECMathematics]

It doesn't matter

[@ayannalewis8470]

Find cosine rule

[@ayannalewis8470]

Cosine rule