Sorry sir, in that question of calculating angle B . Will it be fine if i calculate it in other method like calculating the distances of the lines that includes angle B which is line AB and CB then use cosine rule to calculate angle B?
So the angle of inclination is always the angle between the x axis and the line.So it doesn't matter if the line is by the negative x axis.Tan x=m works on both sides of the x axis as long as the angle is between the x axis and line?
For (c) i used sine rule to get angle C then got 36 , 87 then used the Area Rule that is ½absin(c) then got 18 units² . Mind you for (b) i used Cosine Rule so i calculated all of my length there so it was then easier to get (c) by just using them from there then ye . You are amazing Malume ❤❤.
Sir for angle B i calculated the lengths of all sides and after I used the cosine rule to find angle B but I don’t get the same answer I don’t understand
sir with regards to 1b i dont understand how you got to the angle of 116.57° because i ended up with 109.52° although i typed in the same thing in the calculator. 15:15
Apologies I made an error with the area formula by omitting 1/2
Hi sir so this means the answer would be 18 units^2
So helpful. Thank you so much Mr Nkosi. May we reap the benefits of these online videos. Super grateful. 🙏❤️
I hope you do...
I recommend this channel to any matriculant
Thank you
Thank you Sir for your help, and I was blaming myself for choosing this subject . I really appreciate your lessons
You are very welcome
Hi sir can i ask for 1c why did you add the 9+36 to get 45 instead of punching the square root of 9+36 into the calculator to get 3 root 5?
thought i made a mistake i am glad someone noticed
I'm I the only one struggling to understand how he got the angle B😭😭
Those questions require an understanding of geometry as well… Are you sorted there by Geometry?
So I just wanted to ask why do we have to construct rather than using the m of AB to find angle B??
Thanks a lot ,this video's are really helpful
You’re welcome. Thank you for being part of the family
Sorry sir, in that question of calculating angle B . Will it be fine if i calculate it in other method like calculating the distances of the lines that includes angle B which is line AB and CB then use cosine rule to calculate angle B?
Yes you may
And how much was your angle?
So the angle of inclination is always the angle between the x axis and the line.So it doesn't matter if the line is by the negative x axis.Tan x=m works on both sides of the x axis as long as the angle is between the x axis and line?
Correct
For (c) i used sine rule to get angle C then got 36 , 87 then used the Area Rule that is ½absin(c) then got 18 units² . Mind you for (b) i used Cosine Rule so i calculated all of my length there so it was then easier to get (c) by just using them from there then ye . You are amazing Malume ❤❤.
yes i also got the same he made a mistake because the formula of a triangle is 1/2absin(c) he just forgot to add the half
Thank you so much sir...God bless
You’re most welcome 🤗
Advantageous.Thanks a ton Sir .May you pls help in finding the area of a parallelogram🙏
Alright…
We are close to 50k😁🙈🙌
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Keep sharing!!!
Sir for calculating area ..was it not supposed to be 1/2 ab.bc SinB?
Askies… This old man has a tendency of making silly errors. I sincerely beg your pardon 🤗
@@MlungisiNkosi Sir I personally think you should pin 📌 this comment 😉 coz not including 1/2 confused thr whole equation
@@flexace768 I just did… thank you
Sir for angle B i calculated the lengths of all sides and after I used the cosine rule to find angle B but I don’t get the same answer I don’t understand
same, i got 85.24
Hello Respected Sir, why in this case we use A as our second co-ordinate and B as our first?
It really doesn't matter which one you start with. As long as you maintain the order on both co-ordinates
@@MlungisiNkosi Bless you Sir.
Sir, with b, the angles add up to more than 180⁰
I will look into it… It might be a slight error.
Can you please revise the grade 12 physical science term 1 test for 2022 Gauteng province
Please send me a copy via email at info@mlungisinkosi.co.za
@@MlungisiNkosi okay sir
Hi sir I did( b) differently but I got everything you got.
That’s awesome 😎
pls explain how you did B 🥹
@@amzokafile4858 I used the cosine rule
@@molemokhanye3418 thank you 💗
@@molemokhanye3418 you are smart
Hii
Please help me out,So Everytime I want an area of a triangle,I must use the sin rule.
Having to sides and an included angel?
Use the area rule
sir with regards to 1b i dont understand how you got to the angle of 116.57° because i ended up with 109.52° although i typed in the same thing in the calculator. 15:15
Please make sure you calculator is in degrees
Lol i went for the shottest way by using Cosine Rule and getting the very same answer 😂❤
Hello sir, do we always add 180 when get a negative angle?
Yess
I got 41.67⁰ for ange B
Hello sir, is the area of triangle ABC not= 1/2AB.BCsinb
Oops… I forgot the 1/2 hey. Sorry about that
Im struggling to understand 1 b).
You’re welcome