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Really stuck on this please help!
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Really stuck on this please help!

Really stuck on this please help!-example-1
User Pavlo Dyban
by
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1 Answer

3 votes

Answer:

4) BC=30.14

11)XZY≈47.5°

Explanation:

4) we use cosine law because we have two length known and one angle known

BC²=AB²+AC²-2ABcos55°

BC²=23²+20²-2*23*20cos55°=908.6

BC=√908.6= 30.14 cm

11) we use cosinee law because three length known

cosXZY=(22²+20²-17²)/(2×22×20)

cosXZY=0.676

XZY^= cos^-1 0.676

XZY^=47.5°

User Sharma
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