The landform located at number 5 on the map above is a(n) O estuary
O isthmus
O peninsula
O island

O isthmus

Explanation:

The land form depicted by number 5 clearly shows an isthmus. An isthmus is a piece of land that connects two separated lands. It is made up of a thin strip of land. An isthmus made up of sand bars is called a tombolo.

An estuary is a place of brackish water where the ocean meets with the rivers from inland. A peninsula is very similar to an island. It is isolated almost on all its borders but connected to the land on one part. An Island is a body of land surrounded totally by water.

None of the other description fits number 5 in the diagram therefore, it is an isthmus.

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2pi more meters because you find the circumference which is 6pi and 4pi and subtract it and you get 2pi