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2 votes
1) Solve for Side A

2) Solve for Angle B

1) Solve for Side A 2) Solve for Angle B-example-1

2 Answers

5 votes

Answer:

1) 42.51

2) 39.76

User Mohsen TOA
by
8.6k points
2 votes

Answer:

solution given;

let

AB=a

AC=b=30ft

AB=c=20ft

<A=115°

By using Cosine rule.

a²=b²+c²-2bc cos angle

a²=30²+20²-2*30*20 Cos 115°

a²=1807.1419

a=√[1807.1419]

a=42.51

Side A is 42.51ft.

Again

Cos B=
(a²+c²-b²)/(2ac)

Cos B=
(42.51²+20²-30²)/(2*42.51*20)

Cos B=0.7687

<B=Cos -¹(0.7687)

<B=39.46°

Angle B is 39.46

User Martien Lubberink
by
7.9k points

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