Length of side of square JKLM = 6 cm
Area of square JKLM = 62 = 36 cm2
Since A & B are the mid points of KL & LM
KA = AL = LB = LM = 3 cm
Area of Δ AJB = area of square – area of Δ AKJ – area of Δ ALB – area of Δ BMJ
= 36−(1/2)x6x3 − (1/2)x6x3
= 36 − 9 − 4.5 − 9
= 13.5 sq. units
Probability that the point will be chosen from the interior of ΔAJB = (Area of ΔAJB)/(Area of square)