<span>Well, I'm pretty sure there are four. The northern and southern hemispheres, and then the eastern and western hemispheres.</span>
By the mid 2030's. You can find it on their website.
Answer : The value of
is
.
Explanation :
As we are given 6 right angled triangle in the given figure.
First we have to calculate the value of
.
Using Pythagoras theorem in triangle 1 :




Now we have to calculate the value of
.
Using Pythagoras theorem in triangle 2 :





Now we have to calculate the value of
.
Using Pythagoras theorem in triangle 3 :





Now we have to calculate the value of
.
Using Pythagoras theorem in triangle 4 :





Now we have to calculate the value of
.
Using Pythagoras theorem in triangle 5 :





Now we have to calculate the value of
.
Using Pythagoras theorem in triangle 6 :





Therefore, the value of
is
.
The correct answer for this question would be A) an oxbow lake.