# Math Is Fun Forum

Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫  π  -¹ ² ³ °

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## #1 2023-04-21 20:09:39

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.

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## #2 2023-05-02 01:44:37

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

### 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

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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## #3 2024-04-05 23:43:34

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

### 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.

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