In the picture below, EFGH, ABCD are squares, and ABE, BCF, CDG, DAH are equilateral triangles (each built outward on a side of ABCD, with apex at a corner of EFGH). What is the ratio of the area of the square EFGH to that of ABCD? [Figure: see page 16 of source PDF]

In the trapezium ABCD the sides AB and CD are parallel. The value of sin∠BAC / sin∠BAD is

What is the maximum number of points that can be placed on a circular disk of radius 1 metre (some of the points could be placed on the bounding circle of the disk) such that no two points are at a distance of less than 1 metre from each other?

log(97 − 56√3) / log √(7 + 4√3) equals which of the following?

The figure below shows two right angled triangles ΔOAB and ΔOQP with right angles at vertex A and P, respectively, having the common vertex O. The lengths of some of the sides are indicated in the figure: OA = 3, AB = 1, OP = 2, PQ = 1. (Note that the figure is not drawn to scale…

Let C be a circle of radius √20 cm. Let L1, L2 be the lines given by 2x − y − 1 = 0 and x + 2y − 18 = 0, respectively. Suppose that L1 passes through the center of C and that L2 is tangent to C at the point of intersection of L1 and L2. If (a, b) is the center of C, which of the…

Consider the function f(x) = (x + 4)(x + 6)(x + 8) ⋯ (x + 98). The number of integers x for which f(x) < 0 is:

Let P be the point of intersection of the lines 3x + 4y = 2a and 7x + 2y = 2018, and Q the point of intersection of the lines 3x + 4y = 2018 and 5x + 3y = 1. If the line through P and Q has slope 2, the value of a is:

Let ABC be an isosceles triangle. Suppose that the sides AB and AC are equal and let the length of AB be x cm. Let b denote the angle ∠ABC and sin b = 3/5. If the area of the triangle ABC is M square cm, then which of the following is true about M?