Question 720014
let x = the length of the two equal legs
let h = the hypotenuse
:
the area of a right triangle is 210 square meter 
{{{1/2}}}x*x = 210
x^2 = 420; multiplied both sides by 2
x = {{{sqrt(420)}}}
x = 20.494 ~ 20.5
:
its perimeter is 70 cm.
2(20.5) + h = 70
h = 70 - 41
h = 29 is the hypotenuse
:
See if this checks out
h = {{{sqrt(20.5^2 + 20.5^2)}}}
h = 28.99 ~ 29 is that close enough?