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nata0808 [166]
3 years ago
11

Find m∠C m . A. 34 B. 57 C. 52 D. 64

Mathematics
1 answer:
lara [203]3 years ago
3 0

Answer:

  B.  57

Step-by-step explanation:

You can solve the triangle using the Law of Cosines, then find the required angle using the Law of Sines. Or, you can estimate it based on the fact that the angle shown is very nearly 90°.

If ∠B were 90°, then the value of ∠C would be ...

  ∠C ≈ arctan(21/14) ≈ arctan(1.5) ≈ 56.3°

Since ∠B is slightly smaller, ∠C will be slightly larger. The nearest value slightly larger than 56.3° is choice B, 57°.

_____

Doing this the long way, you get ...

  b² = a² + c² - 2ac·cos(B) = 14² +21² -2(14)(21)cos(89°) ≈ 626.738

  b ≈ √626.738 ≈ 25.035

Then angle C is given by the law of sines as ...

  sin(C)/c = sin(B)/b

  C = arcsin(c/b·sin(B)) ≈ arcsin(0.838707) ≈ 57.004°

  m∠C ≈ 57°

_____

Many graphing calculators can solve triangles, as can phone or tablet apps.

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Step-by-step explanation:

5x-12=13

5x -12 =13

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Step-by-step explanation:

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kipiarov [429]

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<h3>Graph of inequalities</h3>

Inequalities are expression not separated by an equal sign. According to the question, we ned the inequality's graph that will have a dashed boundary line.

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Answer:

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Step-by-step explanation:

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