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atau
V1.V2 = (2i+3j).(4i+5j)
= (2.4)i² + (3.5)j²
= 8.1 + 15.1
= 8 + 15
= 23
= (2i+3j) (4i+5j)
= 8i+15j
besarnya vektor = √8²+15²
= √64+225
= √289
= 17