
; to find the length of the hypotenuse, you have to use the pythagorean theorem, which states that, in a right triangle,

.

and

would be the two legs, while

would be the hypotenuse. You need to plug in the values of the legs as

and

:

. Solve for the squares of the two numbers, resulting in

, and ultimately

. Find the square root of

and

, and you get

.
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Answer:
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They are called fringing reefs. They grow directly from shore and form borders along the shoreline.
When a fringing reef continues to grow upward from a volcanic island that has sunk entirely below the sea level, an atoll is formed. Atolls are usually circular or oval in shape, with an open lagoon in the center.
The fringing reef is the most common type of coral reef. They however tend to be very sensitive to human induced pollution in the water and are easily destroyed by such.
1. lifeless
2. evaporation
3. seeps into
4. surface, pycnocline, deep
5. food web
6. photic