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05-03-2022
Mathematics

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Please help, I dont know what formula to use. BC=?

Please help I dont know what formula to use BC class=

Respuesta :

zsm2800 zsm2800

05-03-2022

Answer:

17

Step-by-step explanation:

Note angle B = 180 - 51 - 39 = 90°

Use sin(39) = BC/27

OR cos(51) = BC/27

Get BC = 17

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