Please give me answer fast

dear student , 

1. perimeter of a triangle = sum of all the sides 

given,

perimeter = 36 cm 

also two sides are given 12 cm and 14 cm 

let the third side be x 

so, 12 + 14 + x = 36 

26 + x = 36 

x = 36 - 26 
x = 10 cm 

so the third side is 10 cm.

2.  area of rectangle = length * breadth

given ,  area = 36 sq cm 

length = 9 cm 

so,  36 = 9 * breadth 

so breadth = 4 cm 

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​​​​​​​Regards