my teacher explained something in class, and i need help understanding will post an attachment.

Question

matlee · Answer

give me a few seconds lol

matlee · Answer

does this work

amistre64 · Answer

at my age, a few seconds may not be wise lol

matlee · Answer

matlee · Answer

lol

amistre64 · Answer

its a pic, it works

matlee · Answer

Oh the link does work?

amistre64 · Answer

sure, either that or im getting a live feed from canada ...

amistre64 · Answer

what do you need help with?

matlee · Answer

I just need to know how he got the answer to the first one

matlee · Answer

Where does it begin?

amistre64 · Answer

|dw:1427929840002:dw|

this is the original information right?

matlee · Answer

Yes !

amistre64 · Answer

and we want the area of the arced part, the secotr

matlee · Answer

Yes

amistre64 · Answer

well, i know how i would approach it ... or do you want your teachers approach?

matlee · Answer

I dont mind, id prefer yours

amistre64 · Answer

well, its not a general approach, i just notice that yo have a part of an equilateral triangle in there

matlee · Answer

Oh yes he told us its not a right triangle

amistre64 · Answer

we will do his approach, simply becuase it shold be related to what youve learned already, and not my own

matlee · Answer

Ok

amistre64 · Answer

we should start by filling all the information we can, what do we know about the sum of the angles of a triangle?

matlee · Answer

Well he just taught us this today but we didnt know how to do it yesterday lol

matlee · Answer

The triangles are not right triangle so it will be 30/30/30

amistre64 · Answer

no, the 3 angles of a triangle add up to?

matlee · Answer

oh my bad 30/60/90

matlee · Answer

LOl

matlee · Answer

sorry, let me just look at it

amistre64 · Answer

the 3 angles of a traingle add up to 180 degrees

matlee · Answer

60/60/60

amistre64 · Answer

|dw:1427930175974:dw|

amistre64 · Answer

so filling in the triangles we have 120 + x + x = 180, what is the value of x?

matlee · Answer

30

matlee · Answer

Oh i see i understand why they are equal now

amistre64 · Answer

so lets work with one triangle now

is the asker participating?  are they attempting to work with me?  or am i just giving out answers?

matlee · Answer

aaw :o

matlee · Answer

Wouldnt the center also be the same angle since its the center of the circle?

amistre64 · Answer

|dw:1427930481345:dw|

now i see trig on the paper, how would you determine the height of the triangle using this information?