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A : If (2,1,-3) , (-2,3,4) , (1,2,2) ar...

A : If `(2,1,-3) , (-2,3,4) , (1,2,2) ` are the midpoints of `bar(BC) ,bar( CA), bar(AB)` of `DeltaABC` then `A=(-3,4,9)`
R : If `(alpha_1,beta_1,gamma_1), (alpha_2,beta_2,gamma_2),(alpha_3,beta_3,gamma_3)` are the midpoints of the sides `bar(BC),bar(CA),bar(AB)` of `DeltaABC` then `A=(alpha_2+alpha_3-alpha_1,beta_2+beta_3-beta_1,gamma_2+gamma_3-gamma_1)`

A

both A and R are true and R is the correct explanation of A

B

both A and R are true but R is not the correct explanation of A

C

A is true but R is false

D

A is false but R is true

Text Solution

Verified by Experts

The correct Answer is:
A
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