 Hello and welcome to the session. I am Deepika here. Let's discuss the question which says a circus artist is climbing a 20 meter long row which is tightly stretched and tied from the top of a vertical pole to the ground. Find the height of the pole if the angle made by the row with the ground level is 30 degree. Let us first understand the trigonometric ratios of the angle C in right triangle ABC. Now in right triangle ABC we have C is equal to C upon hypotenuse that is AB is equal to that is BC upon A that is AB upon BC. Next question we will take the help of this key idea to solve the above question. So let's start the solution. From the figure it is clear that AC is the long row which is making angle 30 degree with the ground and AB is the pole. We have to find the height of the pole. So we have given AC is equal to 20 meter and the ACB is equal to 30 degree and we have to find AB that is height of the pole we have to find. Now to solve the given problem we choose a trigonometric ratio which involves AC and AB. Now according to our key idea either it is sin C or cosecency because cosecency is equal to 1 over sin C that is AC upon AB. So in right triangle ABC we have AB upon AC is equal to sin 30 that is AB upon AC is 20 meter is equal to 1 by 2 as sin 30 degrees 1 by 2 that is AB is equal to 1 by 2 into 20 AB is equal to 10 meter. Hence the height of the pole is 10 meter. Hence the answer for the above question is 10 meter. I hope the solution is clear to you. Bye and take care.