Finding the measure of Triangle ABC

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Discussion Overview

The discussion revolves around solving Triangle ABC given one angle and one side length. Participants explore the relationships between the angles and sides of the triangle, as well as methods for calculating the unknown measures using trigonometric principles.

Discussion Character

  • Homework-related
  • Mathematical reasoning
  • Technical explanation

Main Points Raised

  • One participant expresses confusion about how to start solving the triangle, mentioning they have labeled angle A and side b but are unsure how to proceed.
  • Another participant questions the relationship that must hold between angle A and angle B, indicating a need for clarification on the triangle's properties.
  • There is a suggestion that since it is a right triangle, knowing one acute angle allows for the calculation of the other angle.
  • One participant proposes using the Law of Sines to find the unknown sides once all angles are determined.
  • A later post provides specific angle and side calculations, suggesting that angle B is 44º, and gives values for sides a and c as 8.28 and 11.52, respectively, along with an area calculation.

Areas of Agreement / Disagreement

Participants generally agree on the need to find all angles and sides of the triangle, but there is no consensus on the specific methods or calculations to use, as some participants express uncertainty and others provide differing approaches.

Contextual Notes

Some assumptions about the triangle's properties, such as it being a right triangle, are made but not universally accepted or confirmed. The calculations provided may depend on specific interpretations of the problem and the diagram referenced.

Mizu
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A = 46 degrees

b = 8

I don't even know how to start this and I'm really confused. I've already labeled A and b but I really have no clue on how to continue. .-. Can someone please explain this very carefully to me and use simple terms?

I've been trying to do this problem and I was told that I start it by doing 10 x sin 18, but I'm not really sure why that is done. So far I got a =0.053, I'm not sure if that's right or wrong so yeah. .-. I need to find a, b and c and I'm confused on what to multiply.
 
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What relationship must hold between $\angle A$ and $\angle B$?
 
MarkFL said:
What relationship must hold between $\angle A$ and $\angle B$?

The directions say " Solve Triangle ABC using the diagram and the given measurements. "

It's referring to the lowercase b, which is a side of the triangle in the example diagram.
 
Mizu said:
The directions say " Solve Triangle ABC using the diagram and the given measurements. "

It's referring to the lowercase b, which is a side of the triangle in the example diagram.

I am assuming you are to find the measure of all angles and sides. Since it is a right triangle, and you know the measure of one of the acute angles, what must the measure of the other be?

Once you know all 3 angles, and you know at least 1 side's measure, you can then use the Law of Sines to find the measures of the unknown sides.
 
Angles sum = 180º
B = 180º - 90º - A = 44º
Use sine law for a and c.
a = 8.28 and c = 11.52
Use Pythagoraem's theoreme for area.
area = 33.14 ( ² )
 

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