Quantitative Aptitude - Arithmetic Ability Questions

Triangle DEF is right angled at E. If cot D = 5/12, then what is the value of sin F?

The selling price of an article is 8/5th of its cost price. Then the gain percentage is

Find the sum of interior angles of a dodecagon?

If cosec π/4 - ­ sin π/3 = x, then the value of x is

Coefficient of x2 in (x + 7)(5 - 3x)(3x - 6) is

If secA/√(sec2A ­- 1) = x, then value of x is

If (1 - sinA)/(1 + sinA) = x, then x is

ABCD is a quadrilateral with AB = 9 cm, BC = 40 cm, CD = 28 cm, DA = 15 cm and angle ABC is a right –angel
What is the area of quadrilateral ABCD?