luisz
Farial inscribed a quadrilateral ABCD in a circle, as shown below. If the measure of arc BCD is 220°, what is the measure of angle BCD?



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luisz
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luisz
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yeh!!!

luisz
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any tips?

LoveYou*69
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I don't know:( I am sorry, I will try to get someone who will know here tho!:D

luisz
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ty

luisz
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k

luisz
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so did you get someone?

luisz
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ty

terenzreignz
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Are you sure it's the measure of angle BCD you want? you just gave its measure...

luisz
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yes, we need the measure of angle BCD...

luisz
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I mean arc!!!!!!!!!!!!!!!!

luisz
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sorry

luisz
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no

luisz
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I mean angle

luisz
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sorry

legoauto220
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dw:1340465784240:dw Like this? IS the image correct? And we have to get the angle now, the angle C

luisz
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Yes, angle BCD

THE_PROPHET
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70

luisz
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can you tell me how?

luisz
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why is at 70?

luisz
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its correct but why?

legoauto220
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Because 360220=140, and the central angle is double the angle in the circumfrence, so its 70

luisz
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ty

luisz
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I thought the same exact thing

legoauto220
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dw:1340466383693:dw

luisz
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I wasn't sure if it was correct, though.

luisz
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ty

legoauto220
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np

THE_PROPHET
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angle BOD =140 centre is O
angle subtended by chord on cente is twice the angle subtended on the circle .....so 2x = 140
x = 70

luisz
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let me post another problem...