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	Right triangle ABC, points D and E are in the side of BC. AD=AC and BE=AB. How much is angle DAE?
	In , and CD is of angle C. Prove CA+DA=BC.
	Rectangle ABCD, P is in the side of BC and Q is in the side of CD. PA intersects PQ in 45 degree. Prove BP+DQ=QP.
	Circles O1 and O2, their chord AB=8, calculate the distance between their centers (O1O2= ?).
	In circle O, AB and CD are diameters, chord EF is vertical for OC and goes halves in OC. Prove .

　