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 is -175 million years ago.
Pangaea was a supercontinent which was consisted of all the continental masses we know nowadays, just they were all merged into one very large land mass. This supercontinent started to form from the land masses that existed prior to it, and because of the tectonic activity they merged roughly around 335 million years ago. The continent existed during the Paleozoic era, as well as the early Mesozoic era.
With the breaking up of this continent because of the tectonic activity, it split initially into two large continents, Laurasia on the north, and Gondwanaland on the south. With the later break up, Laurasia split into Eurasia and North America, while Gondwanaland split into South America, India (which later moved towards Eurasia and merged with it), Antarctica, and Australia. The formation of the modern day continents also resulted in the formation of multiple oceans instead of one.
One reason is that the plates float on a hot boiling mentle. when the heat rises and the mentle expands the plates above it also moves.
the other reason is that the plates themselves move.plates have warmer inner sides that tend to rise. and colder outer side that tends to sink. this tug of war between the hotter and colder sides of the plate also helps them move.
