Question

If you're good at trig please help meeeee
Show full working out ;)

Answer 1

We break down the area into two triangles - since we're given all their side lengths, we use Heron's formula:
`[area]=√(s(s-a)(s-b)(s-c)),` where
`s=(a+b+c)/(2)`

`[ABD]=√((265)(115)(85)(65))\approx 12975.92`

`[CBD]=√((225)(125)(75)(25))\approx 7261.84`

`[ABCD]=[ABD]+[CBD]\approx\boxed{20238\,\text{m}^2}.`