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**tony123****Member**- Registered: 2007-08-03
- Posts: 229

The isosceles right-angled triangle ABC

has its right angle at C. D is an interior point of side BC such that the angle CDA

is 75°. Given that triangle ADC has unit area, prove that BD=2.

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**Bob****Administrator**- Registered: 2010-06-20
- Posts: 10,503

hi Tony123

It's been a while ... my excuse is I've been away bird watching. Had this method just before I went ... only just got back.

Will check it later for typos.

Bob

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Sometimes I deliberately make mistakes, just to test you! …………….Bob

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**Europe2048****Member**- Registered: 2024-01-03
- Posts: 35

You can put a backslash before the "sin" for it not to display italic.

If it was italic, sin(x) would really mean s×i×n×x.

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