Math Is Fun Forum

tony123

Member

Registered: 2007-08-03

Posts: 229

isosceles right-angled triangle

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.

Bob

Administrator

Registered: 2010-06-20

Posts: 10,617

Re: isosceles right-angled triangle

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

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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

Europe2048

Member

Registered: 2024-01-03

Posts: 38

Re: isosceles right-angled triangle

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.