The circle with diameter of 24 means that 2

r = 24.
Solving for r, we get

r=24.
Dividing both sides by

, we get r=24/

.
The area of the full circle is

times 24 squared over

. The

being multiplied cancels out, meaning that 24 squared over

is the area of the full circle. 24 squared is 576, and dividing by 16 we get

as the answer.
The theory of "continental drift" which proposed that continents were moving or drifting across the Earth sometimes crashing into each other.
There is also the archaeological evidence which shows how the same species of animals are found on two different continents (usually far apart), such as the plant Glossopteris, that has been found on South America, Africa, India, Antarctica, and Australia.