Question

Find ∆ā and ∆a ?
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Answer 1

a d theta,0

From figure ∣∣∣∣OA∣∣∣∣=a and ∣∣∣∣OB∣∣∣∣=a

Also from Δ rule 

OB−OA=AB=Δa⇒∣∣∣∣Δa∣∣∣∣=AB

so, answer is C

Answer 2

Answer:

correct answer is option B

Explanation:

Hope this help you