feglin1 feglin1
  • 10-10-2021
  • Mathematics
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work out the size of angle A

work out the size of angle A class=

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nonyyamryassin nonyyamryassin
  • 10-10-2021
use sin rule first to get angle C
11/sinC = 9/Sin38
cross multiplication
SinC = 11Sin38/9
ARCSinC (sin inverse) to find C
then angle A= 180 minus (angle C plus angle B)
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