briannasukotjo briannasukotjo

22-01-2024
Mathematics

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In A4BC, if mZA =78. AC = 17 meters, and AB = 9 meters, find BC.

In A4BC if mZA 78 AC 17 meters and AB 9 meters find BC class=

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karmenchong karmenchong

22-01-2024

Answer:

17.5 m

Step-by-step explanation:

BC² = AB² + AC² - 2(AB)(AC)cos∠A

= 9² + 17² - 2(9)(17)cos78°

= 306.38

BC = √306.38

= 17.5 m

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