# Alevel maths questionWatch

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#1
Could someone help with this qs please, I’ve looked at the solutions and understand that I have to half the triangle, but I don’t understand how to find the length of EF which is root3r/2 using pythag
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#2
(Original post by Jessica_rica)
Could someone help with this qs please, I’ve looked at the solutions and understand that I have to half the triangle, but I don’t understand how to find the length of EF which is root3r/2 using pythag
This is the qs
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3 weeks ago
#3
(Original post by Jessica_rica)
This is the qs
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#4
(Original post by RDKGames)
Thank you!! Also how is FB = r when BC=r ?
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3 weeks ago
#5
(Original post by Jessica_rica)
Thank you!! Also how is FB = r when BC=r ?
Because the arc from C through F up to A is part of a circle which is centered at B.

F is just another point on this circle, just like C and A are, so their distances from B are the same.
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