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Math Circle Problem

Thread starter shakirmoledina
Start date Mar 12, 2011
Views 2,355
Replies 2

shakirmoledina

Legend

OP

Member

Mar 12, 2011

#1

Can you please solve this for me
Find ACD angle and BDC and length DE. Note the * is actually degrees
E is not the center of the circle
Reasons please too

Thanks bro... wasnt sure about the angles being the same thanks for everything!

http://pix.gbatemp.net/27486/Math.png

Solution

Is AC a straight line? If so:

Angle ACD is 55* (subtends the same arc as angle ABD)

Therefore, angle BDC 33* (angle sum of triangle CDE)

Then you can find DE using the sine rule.
DE/sin55* = 4/sin33*
DE = 4sin55*/sin33*
DE = 6 (approx.)

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nutella

Low Glycemic Index

Member

Mar 13, 2011
Solution

#2

Is AC a straight line? If so:

Angle ACD is 55* (subtends the same arc as angle ABD)

Therefore, angle BDC 33* (angle sum of triangle CDE)

Then you can find DE using the sine rule.
DE/sin55* = 4/sin33*
DE = 4sin55*/sin33*
DE = 6 (approx.)

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Solution

M

m3rox

Well-Known Member

Member

Mar 13, 2011

#3

OP, if you don't know how to use a protractor, google it!

This is simple pre-algebra stuff...

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