But in my dig angle b=90. my co-ordinated were in the wrong places so my answer was wrong.
my working was like this: (as per the 1st dig)
AB=√25=5
BC =√50=5√2
AC= √25=5
using pythagoram theorm, AC²=AB²+BC²
5=5²+5√2²
5 not = 25+50
But as per Alan's dig:
AB=√25=5
BC =√25=5
AC=√50=5√2
using pythagoram theorm, AC²=AB²+BC²
5√2²=5²+5²
50=25+25=50