Quantitative Aptitude - Arithmetic Ability Questions

Which of the following is not a Triangular number?

Δ XYZ is right angled at Y. If m∠Z = 60°, what is the length of YZ (in cm), if ZX = 3√3 cm?

What is the equation of the line perpendicular to the line 5x + 3y = 6 and having Y-intercept -3?

If θ is acute angle and sin(θ+18°)= 1/2, then the value of θ in circular measure is

$$\begin{gathered} If (x – 2)2 + (y + 3)2 + (z – 15)2 = 0, then what is the value of \\ x + y + z – 5? \end{gathered}$$

Reflection of the point (3,-6) in the y-axis is

What are the co­-ordinates of the mid point of the segment joining points C(0,­-3) and D(8,5)?

What is the value of 2sec2A?