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OpenStudy (aonz):
HELP PLEASE!!! ABCD is a cyclic quadrilateral in which AB=5. BC=6. CD=7. AD=8. show that cos ADC = 13/43
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OpenStudy (aonz):
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OpenStudy (aonz):
@kropot72 @terenzreignz @Mertsj Help pls Btw i know angles D+B = 180
OpenStudy (aonz):
@hartnn help please!!!
OpenStudy (mertsj):
There is a formula for this. First let me relabel your picture so you will understand the formula better.
OpenStudy (aonz):
ok... only formula i know is angle B + D=180 and angle A+C = 180
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OpenStudy (mertsj):
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