Search found 183 matches

by asif e elahi
Thu Aug 22, 2013 3:41 pm
Forum: Secondary Level
Topic: function
Replies: 4
Views: 2157

Re: function

Set A has 3 elements.So there are 3 choice for A.Similarly B has 4 choice.So 3$\times $4=12 functions can be formed.
by asif e elahi
Thu Aug 15, 2013 12:47 pm
Forum: International Mathematical Olympiad (IMO)
Topic: IMO 2013, Day 2-P4
Replies: 2
Views: 2131

Re: IMO 2013, Day 2-P4

Let $AH$ meets $BC$ at $L$. So $AL\perp BC$ Let $W$ lies between $L$ and $C$ We have $\measuredangle XBW=\measuredangle XNW=90$. So $\measuredangle XNB=\measuredangle =90-\measuredangle BNW=\measuredangle CNW$ $\measuredangle XBN=90-\measuredangle B=\measuredangle NCW$ So $\triangle XBN$ and $\trian...
by asif e elahi
Wed Aug 14, 2013 1:51 pm
Forum: Geometry
Topic: prove right angle
Replies: 1
Views: 962

prove right angle

The quadrilateral $ABCD$ is inscribed in a circle.The lines $AB$ and $CD$ meet at $E$,The diagonals meet at $F$.The circumcircle of $AFD$ and $BFC$ meet again at $H$.Prove that $\angle EHF$ is a right angle.