SAT数学备考经典模拟题训练20

>>SAT数学模拟题：SAT数学备考经典模拟题训练20

>>SAT考试辅导

9.Correct Answer: B

Explanation:

Since 2 do not play either, there are 28 members who play one sport or the other. Let the number who play both be n.

Total (28) will be made up of only badminton players (17 - n), plus only tennis (19 - n) and those who play both (n).

28 = (17 - n) + (19 - n) + n

28 = 36 - n ; n = 8

10.Correct Answer: C

Explanation:

The total perimeter of the un-shaded part is made up of three sides of the rectangle and the perimeter of the half-circle.

The area of a half circle = ½ π r2

8 π = ½ π r2; therefore r = 4

The perimeter of the half circle is ½ 8 π = 4 π

The diameter of the circle (8) = the length of the rectangle.

Total perimeter of the rectangle = 26

Three sides measure 26 - 8 = 18 Ans. 18 + 4π

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