How to Find Angle BAD & ABC in a Symmetrical Triangle: Helpful Hints"

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In summary, the conversation is discussing how to find the size of the angle BAD and the angles of triangle ABC in a triangle where AB = AC and AD = DB = BC. HallsofIvy has provided a solution using analytic geometry, setting up a coordinate system with the origin at point B and the positive x-axis in the direction of C. The length of side BC is denoted as "c" and the coordinates of other points and equations of the triangle's sides must be found in order to solve the problem.
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Natasha1
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In a triangle ABC, AB = AC and AD = DB = BC. Find the size of the angle BAD? Find the angles of triangle ABC?

Just need a few hints to get this problem started please? :redface:
 
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Natasha: HallsofIvy responded here with most of the solution. I've soft deleted it and will restore it once you have shown some work on this problem.
He used analytic geometry and he started as follows:

HallsofIvy said:
Set up a coordinate system so that the origin is at point B (B is at (0,0))and the positive x-axis is in the direction of C. Call the length of side BC "c" so that C is at (c,0).

You will need to find coordinates of other points and then find equations of the lines that contain the sides of the triangles. Give that a shot and post what you come up with.
 
  • #3


Hello! It seems like you have a symmetrical triangle, which means that two sides are equal in length and the third side is also equal to those two. This creates some helpful relationships between the angles of the triangle.

To find the size of angle BAD, you can use the fact that the sum of angles in a triangle is 180 degrees. Since AD = DB, we can split angle BAD into two equal angles, making it easier to find the size of each individual angle.

To find the angles of triangle ABC, you can use the fact that in a symmetrical triangle, the angles opposite the equal sides are also equal. So, angle ABC and angle ACB will have the same measure. You can also use the fact that the sum of angles in a triangle is 180 degrees to help you find the third angle.

I hope these hints help you get started on solving the problem. Remember to use the relationships between the sides and angles in a symmetrical triangle to your advantage. Good luck!
 

FAQ: How to Find Angle BAD & ABC in a Symmetrical Triangle: Helpful Hints"

What is symmetry?

Symmetry is a mathematical concept that refers to an object or shape being balanced or identical on both sides. It is a fundamental principle in geometry and plays a major role in many areas of science and nature.

How do you determine if an object has symmetry?

An object has symmetry if there is a line or point of symmetry that divides it into two equal and identical halves. To determine this, you can fold the object along a line or rotate it around a point and see if the two halves match up perfectly.

What are the different types of symmetry?

There are three main types of symmetry: reflective symmetry, rotational symmetry, and translational symmetry. Reflective symmetry, also known as mirror symmetry, is when an object can be divided into two equal halves by a line. Rotational symmetry is when an object can be rotated around a point and still maintain its original form. Translational symmetry, also known as repeating symmetry, is when an object can be shifted or translated along a line to create a repeated pattern.

How is symmetry important in science and nature?

Symmetry is important in science and nature because it is a fundamental principle that helps us understand the world around us. It is found in many natural phenomena, such as the patterns on a butterfly's wings or the structure of snowflakes. In science, symmetry is used to describe and predict the behavior of particles and molecules, and it is also a key concept in the study of crystal structures.

What are some real-world applications of symmetry?

Symmetry has many practical applications in our daily lives. In architecture and design, symmetry is often used to create balance and aesthetic appeal. In technology, symmetry is utilized in the design of circuit boards and electronic components. In medicine, symmetry is important for diagnosing and treating certain medical conditions. It is also used in cryptography to create secure codes and patterns.

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