Question

find the area of a triangle two sidesof which are 18 cm and 10 cm and the perimeter is 42 cm

Answer 1

A

≈

69.65

cm²

a

Side

cm

b

Base

cm

P

Perimeter

cm

Answer 2

it is by Heron's formula
first find the third side then use this formula
s=perimeter/2
area =√s(s-a)(s-b)(s-c)
where a,b,c are three sides of triangle