12. If the area of an isosceles right angled triangle is \( 8 cm ^{2} \), then what is the perimete of the triangle?
13. The sides of a triangular field are \( 11 cm , 60 cm \) and \( 61 cm \). Find the number a The sides of a triangular field are \( 11 cm , 60 cm \) and \( 61 cm \). Find the number \( 10 cm ^{2} \) of space.
