Because 26 * 6 =156156/2 = 78 78.

Because 72 * 6 = 432 432/2 = 216216 >: 90 360 <; 432, so no.

Because 90 * 6 = 540 540/2 = 270 270 >: 90 360 <; 540, so no.

Choose a piece of armor

(2).9*30+40*0.5=290 (degrees)

40*6=240 (degrees)

290-240=50 degrees

A: The included angle is 50 degrees.