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Posted: **Mon Apr 11, 2022 6:07 am**

: 2 10p There Are Two Points P1 1 2 2 And P2 1 1 0 In Cartesian Coordinate System For Position Vectors R1 And R2 S 1 (35.37 KiB) Viewed 30 times

2. (10p) There are two points P1(1,2,2) and P2(-1,1,0) in Cartesian coordinate system. For position vectors R1 and R2, solve following problems. (1) Cross product of Ri and R2 (2) Inner angle between R1 and R2 (3) Area of a triangle OP1P2 (4) Circumference of the triangle OP.P2