** 17) What is the surface area of following figure?**

(A) 33 π

(B) 24 π

(C) 25 π

(D) 11 π

** 18) In the figure below, given that AD = 6, CD = 8, AE = x. What is the area of the shaded region?**

(A) 28 - 2x

(B) 4(14 - 4x)

(C) 48 - 3x

(D) 7(6 - 3x)

** 19) If the radius of the circle is decreased by 20%, than the area**

(A) increases by 10%

(B) decreases by 20%

(C) increases by 80%

(D) decreases by 36%