find m angle a with arc DB=35 degrees arc BC=115 and ray AB being tangent to the circle as shown.

Question

anonymous · Answer

attachment

anonymous · Answer

@acxbox22 @freckles @sdfgsdfgs

sdfgsdfgs · Answer

|dw:1430444845598:dw|

not sure about this cuz' seems like too MUCH info is given....

anonymous · Answer

okay and what would the formula be for this one?

sdfgsdfgs · Answer

|dw:1430444995678:dw|

Arc DB=35 so the central angle = 35deg.

anonymous · Answer

so angle A = 35 deg?

sdfgsdfgs · Answer

nope but remember OAB is a right-angled triangle cuz' AB is a tangent....

sdfgsdfgs · Answer

so using the sum of all angles in a triangle = 180, u get....

anonymous · Answer

30 deg?

sdfgsdfgs · Answer

A + 90 + 35 = 180.....

anonymous · Answer

55

sdfgsdfgs · Answer

yes, the only thing is the arc BC=115 is not used at all but it was given...

anonymous · Answer

its okay just practice. in this case it would be 55 deg though?

anonymous · Answer

okay just one more quick one!

sdfgsdfgs · Answer

u done this be4 - use proportion remember? ;)

anonymous · Answer

i feel like it should be so easy but im so tired im  not grasping it lol

sdfgsdfgs · Answer

no, im gonna make u work this one :P

anonymous · Answer

yeah but when i do proportion i dont think im doing it right

sdfgsdfgs · Answer

show me plz? :)

anonymous · Answer

$$\frac{ 2x+3 }{ 4 } = \frac{ x }{ 10 }$$

acxbox22 · Answer

the first one isnt 30 degrees

anonymous · Answer

its 55, right?

acxbox22 · Answer

remember the rule we used the other day?
the 1/2(measure of big arc - measure of small arc)

acxbox22 · Answer

and for the second one thereis an easier rule:|dw:1430445579705:dw|