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Mathematics 11 Online
OpenStudy (thatcreepyboy):

In circle A shown below, Segment BD is a diameter and the measure of Arc CB is 36°: Points B, C, D lie on Circle A; line segment BD is the diameter of circle A; measure of arc CB is 36 degrees. What is the measure of ∠DBC? 36° 72° 18° 54°

OpenStudy (thatcreepyboy):

OpenStudy (thatcreepyboy):

I will medal

jhonyy9 (jhonyy9):

do you know how many degrees is the measure of angle DB ?

OpenStudy (otherworldly):

if u draw it on the circle it is a very small angle so what do u think it would be ^_^

OpenStudy (otherworldly):

just by looking at it u can get the answer u don't necessarily need all that information

jhonyy9 (jhonyy9):

so to asker BD not can being the diameter bc. than the angle measure of BD need being 360/2 = 180 and this angle has on the image just 148 degrees so there something mistake

jhonyy9 (jhonyy9):

bc. suppose the point A is the center of this circle

jhonyy9 (jhonyy9):

Creepyboy how ve got this measure of 148 degrees for angle BAD ?

jhonyy9 (jhonyy9):

@OtherWorldly do you see about i ve told above ?

jhonyy9 (jhonyy9):

<< line segment BD is the diameter of circle A; >> given in the text of this exercise - so in this case angle BAD has 180 degrees and not 148 degrees

OpenStudy (otherworldly):

yes i do but i do not think there is a mistake because if u where to continue line B to the other side the circle that makes another angle right? and 148 + X = 180 if u look at the angle it would be just the right amount for it to equal 180 so nothing is wrong with the 148 angle

jhonyy9 (jhonyy9):

no no than BD is the diameter of circle A so in tis case this center of circle A ,the point A so need being on this diameter line and than you unit BD to being the diameter how you suppose it above so than this center point A of circle A not will be on this diameter line yes ?

OpenStudy (otherworldly):

BD is not half the circle BA is point A is on the diameter line so point A is the mid point remember we r looking for the angle DBC

jhonyy9 (jhonyy9):

@agent0smith please what is so difficile in this exercise ?

OpenStudy (otherworldly):

XD can i just say the answer

jhonyy9 (jhonyy9):

but than you read the text of this exercise so given that BD is diameter

OpenStudy (otherworldly):

yeah..... thats weird

jhonyy9 (jhonyy9):

@agent0smith please help me make understanding this image not is right

OpenStudy (otherworldly):

maybe @ThatCreepyBoy put the problem wrong..?

OpenStudy (otherworldly):

do u know the answer @jhonyy9

OpenStudy (otherworldly):

because even in this mix up u don't need that information to find the answer

jhonyy9 (jhonyy9):

i just like clearify to asker that idk. how he got this angle has 148 degrees bc. this is wrong sure

OpenStudy (otherworldly):

The information in the problem is incorrect, sure, but from the question and the picture u can find the answer

jhonyy9 (jhonyy9):

sorry but i think from this image not can find it correct

OpenStudy (otherworldly):

ok so ill just say what i think the answer is and u guys can figure out if its right or wrong i think it is C

jhonyy9 (jhonyy9):

<< we need calculi the measure of ANGLE DBC - how juts bc. angle DBC not exist there

jhonyy9 (jhonyy9):

or than exist so these given choices not are right

jhonyy9 (jhonyy9):

@agent0smith your opinion about these please ?

jhonyy9 (jhonyy9):

given that DB is diameter so tis mean that angle DAB not equal 148 degrees sure right ?

jhonyy9 (jhonyy9):

than we drawing this angle << What is the measure of ∠DBC? >> where will be this angle DBC ?

jhonyy9 (jhonyy9):

|dw:1475529203693:dw|

jhonyy9 (jhonyy9):

but in this case BD not is diameter

jhonyy9 (jhonyy9):

|dw:1475529601431:dw|

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