Answer:

34.86 sq cm

Step-by-step explanation:

Perimeter = 30 cm

each of the equal side = 12 cm

third side = 30 --(12+12)

= 30--24

= 6 cm

When all three sides are given,

Area = 1/2 ( √a^2--b^2/4) b

where a= dimension of equal side = 12 cm

b = third side = 6 cm

Area = 1/2 { √ (12)^2--(6)^2/4 } 6

= 1/2 { √ 144--9 } 6

=3 { √ 135}

=3(11.62)

= 34.86 sq cm