Answer 1

Using distance formula:

`d = sqrt((x_2 - x_1)^2 + (y_2 - y_1)^2)`

Here, x₁ = a, y₁ = b, x₂ = -a and y₂ = -b

On substituting the values in the formula we get

`sqrt((-a - a)^2 + (-b-b)^2)`

= `sqrt((-2a)^2 + (-2b)^2)`

=`sqrt(4a^2 + 4b^2)`

= `2sqrt(a^2 + b^2)`

Therefore, the distance between (a,b) and (-a,-b) is `2sqrt((a^2) + (b^2))`