Question

The distance from point A to point D is 73 units and the length from point D to point C is 48 units. Find the distance between point A and Point C.

Answer 1

`25\le AC\le 121`

Explanation:

The key to this question is that the length of a side of a triangle is larger than the difference of the other 2 sides and is smaller than the sum of the other 2 sides. Hence the length of AC is larger than (or equal to, in case A, C, D do not form a triangle but are on the same line)
`73-48=25` and is smaller than (or equal to)
`73+48=121`.