In the given figure, XYXY and X′Y′ are two parallel tangents to a circle with center O and another tangent AB with the point of contact C intersects XY at A and X′Y′ at B. Find the measure of ∠AOB.
Sanjeewa filled a glass with water. The lower base radius and the upper base radius of the glass is 7cm and 10cm respectively. The height of the glass is 12cm. At first, the glass is filled full with water and the water is poured into another container which is cylindrical in shape with the diameter and the height as 30cm and 17cm respectively. Again the glass is filled one-fifth with water and then this water is poured into the same cylindrical container. How much more water is to be put into the cylindrical container so as to fill the container up to the brim? (Where π=3.14)
Three coins are tossed simultaneously 500 times and it is found that three heads appeared 250 times, two heads appeared 175 times, one head appeared 50 times and no head appeared 25 times.
If three coins are tossed simultaneously at random, what is the probability of getting 1 head ?