We are given
both triangles are similar
Let's assume side of bigger triangle is 'a'
side of smaller triangle is 'b'
so, a=54cm
b=18cm
now, we can find ratios


The area of the larger triangle is 603 cm²
so,

area of smaller triangle is As
we are given
both triangles are similar
so, we get

now, we can plug values
and we get



so,
the area of smaller triangle is
..........Answer