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Since all sides are equal and I am assuming that one side = 5, than all sides =5 including the base.
Draw a picture of the triangle with all sides =5.
Area=(1/2)(base)(height)[Formula for the area of a triangle]
A=(1/2)(5)(h) [Plug-in the values]
To find the value of the height, use the Pythagorean Theorem:
Since entire base is 5, use (1/2)(base)=(1/2)(5)=2.5 in the Theorem:
Since all sides=5, use 5 as one side in the Theorem:
A=(1/2)bh [Plug-in the values]
Check by plugging all of the values back into the Pythagorean Theorem.