Question

explain the area and perimeter of a triangle[formula] and explain pythagorus theorum.

Answer 1

area of a triangle =1/2xbasexheight
perimeter of a triangle = sum of all three sides
            Pythagorus theorum
The square of the hypotenuse  is equal to  the sum of the squares of the other two sides.
  hyp² = base² + height²

Answer 2

AREA OF A TRIANGLE =$\frac{1}{2} base* height$

PERIMETER = sum of all the three sides 

PYTHAGORAS THEOREM =
 
c=√a²+b²

where c is hypotenuse and a and b are other two sides