What is the median class?

Out of the two concentric circles,the diameter of the outer circle is 26cm and the chord MN of length 24 cm is tangent to the inner circle.The radius of the inner circle is

Consider the following questions

1.If the non-parallel sides of a trapezium are equal,then it is cyclic

2.If the chord of a circle is equal to its radius,then the angle subtended by this chord at a point in major segment is 30

Which of the above statements are correct?

The complement angle of 80 is

At 8:30,the hour hand and minute hand of the clock  form an angle of

Let OA,OB,OC and OD are rays in the anti-clockwise direction such that <AOB=<COD=100,<BOC=82 and <AOD=78.Consider the following statements.

1.AOC and BOD are lines

2.<BOC and <AOD are supplementary

Which of the above statements are correct?