6. ABC is a right-angled triangle and O is the midpoint of the side opposite to the right angle. Explain why O is equidistant from A, B and C. (The dotted lines are drawn additionally to help you).
Draw line AD and DC such that and
.
and
ABCD is a rectangle as it has opposite sides equal and parallel.
All angles of rectangle are and rectangle has two diagonals equal and bisect each other.
Hence, AO = BO = CO = DO
O is equidistant from A,B,C,D.