Knowing that O is the center of the circle, find x in the following cases:
a) b)
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Given four distinct points A, B, C and D in a straight line, how many rays whose endpoints are A, B, C or D are there in this line?

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The length of the two parallel sides of a right trapezoid are 6 cm and 8 cm, respectively top and bottom bases, and the altitude is 4 cm. The distance between the intersection of the two straight lines that contain the non-parallel legs and the midpoint of the major base is:

a) cmb) cm
c) cmd) cm
e) none of these

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