SAT Subject Test Mathematics Level 1

(D) 3 x

(E) 4 x

3 . In Figure 3, ∆ABC is equilateral and ∆ADC is isosceles. If AC = 1, what is
the distance from B to D?

Figure  3

(A) 0.286

(B) 0.318

(C) 0.333

(D) 0.366

(E) 0.383

4 . In Figure 4, the perimeter of isosceles trapezoid ABCD is 50. If BC = 9
and AD = 21, what is the length of diagonal ?