Consider a circle with centre at O and radius 7 cm. Let QR be a chord of length 2 cm and let P be the midpoint of QR. Let CD be another chord of this circle passing through P such that ∠CPQ is acute. If M is the midpoint of CD and MP = √24 cm, then which of the following statements are correct

1. ∠QPD = 135⁰
2. If CP = m cm and PD = n cm, then m and n are the roots of the quadratic equation x²-10x+1 = 0.
3. The ratio of the area of triangle OPR to the area of triangle OMP is 1:2√2.

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There are five lines in a plane, no two of which are parallel. The maximum number of points in which they can intersect is

Which of the following is correct in respect of the equation 3-tan²θ = ∝ (1-3 tan²θ)? (Given that ∝ is a real number.)

In a triangle ABC if A-B = ∏/2, then C+2B is equal to 

If 

cos²θ-3cosθ+2/sin²θ=1

where 0 < θ < ∏/2, then which of the following statements is / are correct

1. There are two values of  θ satisfying the above equation.
2.  θ=60⁰ is satisfied by the above equation.

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Two observers are stationed due north of a tower (of height x metre) at a distance y metre from each other. The angles of elevation of the tower observed by them are 30⁰ and 45⁰ respectively. Then x/y is equal to