Depends on whether you're talking about finding just one miscellaneous side of a triange...u just use PYTHAGORA's THEOREM: a^2 + b^2 = c^2 U get find b or a aswell by reversing the theroem HENCE: b^2 = c^2 - a^2 Remember c is the hypotenuse and the a and b are the other two sides (adjacent and opposite) To find the area: that's a different question and rite now i have to go teach my YEAR 12 students... CYA =============================== The way to find the perimeter of a triangle is the same as the way to find the perimeter of any other figure: add together the lengths of all the sides.
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Lengths of: equal side+equal side+base = perimeter
Perimeter of a triangle = (length of the first side) plus (length of the second side) plus (length of the third side)
I'm assuming that you mean the area of the triangle. You do not need the entire perimeter. The formula is 1/2 bh. b=base, h=hight
you add the sides together . a /\b a+b+c /_\ c
There is no reason for the perimeter of a triangle to have any relation to the perimeter of an unrelated rectangle!