63.
What is the difference in area(in cm2) of ΔABC having sides of 10cm, 20cm and 20cm, and a right angled triangle ΔPQR with hypotenuse of 13c and one of the perpendiculars of 12cm?
Note: √2=1.41, √3=1.73, √7=2.65, √13=3.61, √15=3.87, √21=4.58