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Corollary 1
A diagonal divides a parallelogram into 2 congruent triangles
Corollary 2
All angles at points of a circle, standing on the same arc are equal
Corollary 3
Each angle in a semi-circle is a right angle
Corollary 4
If the angle standing on a chord [BC] at some point of the circle is a right angle, then [BC] is a diameter
Corollary 5
If ABCD is a cyclic quadrilateral, then opposite angles sum to 180 degrees
Corollary 6
If 2 circles intersect at one point only, then the 2 centres and the point of contact are colinear