A-Level Further Maths F5-07 Intersections: Finding the Distance from a Point to a Plane
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- Опубликовано: 25 авг 2024
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this method is so much better than the one in the cgp revision guides. Thank you!
Congratulations sir on 46k sir.
can't you just use that formula your given in the Edexcel formula booklet
Yes you can, but this topic comes up in the DfE guidance document before the Vector Product does. So I show here how you can do it without the vector product, and then I develop the vector product in the next section.
Have you (or if not, would you) consider doing a playlist on Teaching GCSE Maths for all the major exam boards? May you link the playlist if you have covered all of GCSE mathematics already. Ty
I have an old spec Foundation playlist? Thing is that I don’t teach GCSE Maths so it’s not a priority and it would be a BIG job!
Could you do some videos about finding distances using vector product please?
Vector Product will be all in the next section
Hi Sir, do you know what paper these Pure questions are from:
prove by contradiction that there are no positive integers a and b with a odd such that a+2b = √(8ab)
and
A piece of jewellery used in a brooch is in the shape of a segment of a circle. The segment itself is made from the silver metal which costs £1.90 per cm2 It is bordered all the way around by a gold metal trim which costs £2.30 per cm. If the radius of the circle is 4 cm and the angle subtended at the centre is 2π/3 radians, find correct to the nearest penny the cost of the jewellery piece.
I cant find the mark scheme. thanks
I don’t recognise them I’m afraid
@@TLMaths ok thank you, how would you approach the jewellery question - differentiation rates of change? its a 10 marker
Don't you just want to find the perimeter of the segment by finding the arc length (using theta x r) + the length of the triangle (using cosine rule), then multiply by (1.90+2.30)?
@@TLMathsoh ok i thought that was too simple for 10 marks
Wait a minute, I misread the question - I didn't spot the squared on the units for the silver. So the area of the segment is £1.90 per cm^2.
So you want to find the area of the segment in cm^2 and multiply that by £1.90, then find the perimeter of the segment in cm and multiply that by £2.30.