One radian is approximately equal to

 Study the following question and decide that which of the following information is sufficient to answer the question? What is the value of $\angle \mathrm{ACB}$ ?

Information:

1. 

2.$\angle D={60}^0$

A ball is rolling without slipping in a spherical shallow bowl (radius $R$ ) as shown in the figure and is executing simple harmonic motion. If the radius of the ball is doubled, then the time period of oscillation

In the given diagram, point R and Q are on PS. ÐPQT = x°, ÐRQT = (x – 50)° and ÐTUR = (x + 25°). find the value of ÐURS.

In $△\mathrm{ABC},$ if $\mathrm{AB}=\mathrm{AC}$ and $\angle \mathrm{BAC}={40}^{\circ }$, then the measure of $\angle \mathrm{B}$ is:

Read the given question and decide which of the following information is sufficient to answer the question.

What is the value of 0?

Information :

(II) 0 < q < 90°

A huge circular arc of length $4.4 \mathrm{ly}$ subtends an angle $4\mathrm{s}$ at the centre of the circle. How long it would take for a body to complete $4$ revolution if its speed is $8 \mathrm{AU}$ per second?
Given : $1 \mathrm{ly}=9.46\times {10}^{15} \mathrm{m}$

$1 \mathrm{AU}=1.5\times {10}^{11} \mathrm{m}$