The "heart" shown in the diagram is formed from an equilateral triangle and two congruent semicircles on .
The two semicircles meet at the point . The point is the centre of one of the semicircles. On the semicircle with centre , lies a point . The lines and are extended to meet at and respectively. The lines and are of equal length.
What is ?
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20^\circ
25^\circ
30^\circ
40^\circ
45^\circ
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