# 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 2015-03-04 02:26:33

Maou-Sama
Member
Registered: 2015-03-03
Posts: 9

### trigo problem

how to solve this please help.

Last edited by Maou-Sama (2015-03-04 02:27:49)

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## #2 2015-03-04 04:55:44

Bob
Administrator
Registered: 2010-06-20
Posts: 9,607

### Re: trigo problem

hi Maou-Sama

You can use trig on triangle OAC to get OA and AC.  Leave your answers with root 3 when it comes up rather than an approximate decimal.

From that you can get the area of the triangle and the rectangle.

Then the sector by pi/3 times r squared / 2 and subtract.

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 2015-03-04 05:12:14

Maou-Sama
Member
Registered: 2015-03-03
Posts: 9

### Re: trigo problem

thanks bob but when do you know which to pick
eg: cos30=√3/2 while tan 30=1/√3

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## #4 2015-03-06 21:23:44

Bob
Administrator
Registered: 2010-06-20
Posts: 9,607

### Re: trigo problem

Looks like you'll have to use cos and sin in this problem.

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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## #5 2015-12-18 02:00:27

Relentless
Member
Registered: 2015-12-15
Posts: 631

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