Rohan wants to measure the distance of a pond during the visit to his native.
He marks points A and B on the opposite edges of a pond as shown in the
figure below. To find the distance between the points, he makes a right-angled
triangle using rope connecting B with another point C are a distance of 12m,
connecting C to point D at a distance of 40m from point C and the connecting D
to the point A which is are a distance of 30m from D such the ADC=900
. Solution briefly