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?

If the angle between radii of a circle is 130°,then the angle between tangents at the ends of the radii is

Three equal circles each of diameter d are drawn on  a plane in such a way that each circle touches the two other circles.A big circle is drawn in such a manner that it touches each of the small circles internally.The area of the big circle is πd²   (√3+2)²

The diagonals of a trapezium are at right angles,and the slant sides if produced,form an equilateral triangle with the greater of the two parallel sides.If the area of the trapezium is 16 sq.cm,then the distance between parallel sides is