Math Problem Statement

In triangle​ ABC, the size of angle B is 44 times the size of angle​ A, and the size of angle C is 99degrees° less than 55 times the size of angle A. Find the size of the angles.

Solution

Let the size of angle AA be denoted as xx degrees.

Given:

  • The size of angle BB is 44 times the size of angle AA, so angle B=44xB = 44x.
  • The size of angle CC is 99 degrees less than 55 times the size of angle AA, so angle C=55x99C = 55x - 99.

We know that the sum of the angles in a triangle is always 180 degrees:

A+B+C=180A + B + C = 180^\circ Substituting the expressions for AA, BB, and CC: x+44x+(55x99)=180x + 44x + (55x - 99) = 180 Simplifying the equation: x+44x+55x99=180x + 44x + 55x - 99 = 180 100x99=180100x - 99 = 180 Adding 99 to both sides: 100x=279100x = 279 Dividing by 100: x=2.79x = 2.79

Now, we can calculate the sizes of the angles:

  • A=x=2.79A = x = 2.79^\circ
  • B=44x=44×2.79=122.76B = 44x = 44 \times 2.79 = 122.76^\circ
  • C=55x99=55×2.7999=153.4599=54.45C = 55x - 99 = 55 \times 2.79 - 99 = 153.45 - 99 = 54.45^\circ

Therefore, the angles are:

  • A=2.79A = 2.79^\circ
  • B=122.76B = 122.76^\circ
  • C=54.45C = 54.45^\circ

Would you like further details on any step?

Here are 5 related questions to deepen understanding:

  1. How do you verify if the sum of the angles in a triangle is correct?
  2. What happens if one of the angle relations is changed, e.g., BB is 45 times AA?
  3. Can a triangle have two angles larger than 90 degrees? Why or why not?
  4. How can you express the relationship between angles of a triangle using algebraic equations?
  5. What are the properties of a triangle with one angle being much smaller than the others?

Tip: In any triangle, the sum of the angles is always 180 degrees, which is a key fact to remember in solving angle problems.

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Math Problem Analysis

Mathematical Concepts

Geometry
Algebra

Formulas

Sum of angles in a triangle: A + B + C = 180°
Linear equations

Theorems

Sum of interior angles in a triangle equals 180°

Suitable Grade Level

Grades 8-10