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#1 2016-01-29 12:59:33

Hate Number Theory
Member
Registered: 2015-12-22
Posts: 11

2 trig problems

Points $A$, $B$, and $C$ are on the circumference of a circle with radius 2 such that $\angle BAC = 45^\circ$ and $\angle ACB = 60^\circ$. Find the area of $\triangle ABC$.

In convex quadrilateral $ABCD,$ $\angle A \cong \angle C,$ $AB=CD=180,$ and $AD \ne BC.$ The perimeter of $ABCD$ is $640.$ Find $\cos A.$
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#2 2016-01-29 20:31:04

Nehushtan
Member
Registered: 2013-03-09
Posts: 957

Re: 2 trig problems

Hi Hate Number Theory.

Please use [ma­th]...[/math] tags, not dollar signs.

Hate Number Theory wrote:

Points

,
, and
are on the circumference of a circle with radius 2 such that
and
. Find the area of
.

In convex quadrilateral

and
The perimeter of
is
Find


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#3 2016-01-30 04:25:57

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: 2 trig problems

Hi;


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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#4 2016-02-01 01:08:09

Bob
Administrator
Registered: 2010-06-20
Posts: 10,053

Re: 2 trig problems


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 smile

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