Math Is Fun Forum

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)

Bob

Administrator

Registered: 2010-06-20

Posts: 10,621

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

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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

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

Bob

Administrator

Registered: 2010-06-20

Posts: 10,621

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

Relentless

Member

Registered: 2015-12-15

Posts: 631

Re: trigo problem