Question

Can someone help me pls, I will really appreciate it

Answer 1

Use the law of cosines to find the missing length, which we'll call
`d:`

`d^2=100^2+120^2-2(100)(120)\cos 45^\circ`

`d^2=24400-12000√(2)`

`\boxed{d\approx 86\text{ cm}}.`