Question

How do you do this question?

Answer 1

We get


`AC^2 + BC^2 = 11^2`


`AD^2 + CD^2 = AC^2`

Adding equations,


`AC^2 + BC^2 + AD^2 + CD^2= 11^2 + AC^2`


`BC^2 + AD^2 + CD^2= 11^2`

For the total sum of squares we need to add
`AB^2`


`AB^2 + BC^2 +AD^2 + CD^2= 11^2 + 11^2 = 242`