Campus Maths Puzzle Numerical Ability

What is the difference between two parallel chords of 24 cm and 32 cm in a circle of radius 20cm

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Campus Other Question

4, 6, 12, 14, 28, 30, ?
1] 32 2] 60
3] 62 4] 64
A semicircle is drawn with ab=diameter from c,a point on ab a line is drawn perpendicular to ab meetting on the circumference f the semi circle.ac-2cm and cd=6 cm.What is the area of the circle?