Needing help with math,, 65 points,, 7th grade math.

1) 6*10=60, 6*7=42/2=21, 21+60=81
2) 12*12=144, 12*12=144*3.14=452.16/2=226.08, 144+226.08=370.08
3) 14*5=70, 5*10=50, 70+50=120 (maybe)
4) 6*5=30/2=15, 4*3=12/2=6,15+6=21
5) 6*6=36*3.14=113.04/2=56.52, 5*5=25*3.14=78.5/2=39.25, 56.52+39.25=95.77
if right then give brainliest plz
6*10=60, 6*7=42/2=21, 21+60=81
12*12=144, 12*12=144*3.14=452.16/2=226.08, 144+226.08=370.08
14*5=70, 5*10=50, 70+50=120
6*5=30/2=15, 4*3=12/2=6, 15+6=21
6*6=36*3.14=113.04/2=56.52, 5*5=25*3.14=78.5/2=39.25, 56.52+39.25=95.77