Question

The side of a triangular base of a prism are 13cm,20cm and 21cm ,find the area of it crooss section

Answer 1

triangular base of prism is uniform to cross section,

so, area of base =area of cross section

now, s=13+20+21/2

s=54/2

s=27

now,area of cross section= √s(s-a)(s-b)(s-c)

√27(27-13)(27-20)(27-21)

√27×14×7×6

√15876