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Question Number 170502 by cortano1 last updated on 25/May/22

	Answered by som(math1967) last updated on 25/May/22

	Commented by som(math1967) last updated on 25/May/22

	$∠ D E C = 90$ $∠ E C D = 90 - 15 = 75$ $∠ E A C = 180 - 75 = 105 ★$ $∠ A B D = θ = 180 - 105 - 55 = 20$ $★ A E C D c y c l i c$
	Commented by JDamian last updated on 25/May/22
	why do you assume that CD is the diameter of a circle?
	Commented by som(math1967) last updated on 25/May/22

	$I a s s u m e f r o m t h e d i a g r a m$ $i f C D i s c h o r d (n o t d i a) t h e n$ $p l e a s e g i v e a n y s o l u t i o n$
	Commented by mr W last updated on 25/May/22

	$t h e r e i s u n i q u e s o l u t i o n o n l y i f$ $C D i s d i a m e t e r .$
	Answered by mr W last updated on 25/May/22

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