Question

two poles of height 25m and 20m stand upright in the field.the distance between the poles is 12 m.find the distance between their tops.

Answer 1

1)Draw the diagram 
2) Join the topmost point of the poles and let the length is x m.
Then use Pythagoras Thm
x²=12²+5²
x²=169
∴x=13 which is the reqd dist between their tops