Please help and explain would I still set this up with law of sine or use cosine
1 answer:
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Answer:
see below
Step-by-step explanation:
You can use the law of sines to choose the correct answer:
b/c = sin(B)/sin(C) ≈ 0.8
For the first answer choice,
sin(44.3)/sin(60.7) ≈ 0.8009 . . . . . . as close as you expect to get
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The second answer choice has the wrong ratio of sines.
The third answer choice has B > C, which it cannot be since b < c.
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The law of cosines can be used to find "a":
a^2 = b^2 + c^2 -2bc·cos(A) = 102500-100000cos(75°) ≈ 76,618
a ≈ √76618 ≈ 276.8 . . . . . . matches the first answer choice
Answer:
81 square inches.
Step-by-step explanation:
Draw a diagram to represent what you know.
You don't know the values of the lengths so represent them algebraically.
You know the perimeter is 45 inches and that the perimeter is calculated by the sum of all of the sides of a shape.
You can rearrange to find the value of a side you've denoted as some unknown variable.
The area is given by the product of the sides. Express this algebraically and then input the value you found.
