math
posted by claire .
calculate the area of a triangle with side lengths 83.75, 110.65, and 90

Using Heron's formula,
the semiperimeter is (83.75+110.65+90)/2 = 142.2
a = √(s(sa)(sb)(sc))
= √((142.2)(142.283.75)(142.2110.65)(142.290))
= 3699.79