Math Problem Statement

Triangle JKL is formed by connecting the midpoints of the sides of triangle GHI. The measures of the interior angles of triangle GHI are shown. Find the measure of ∠GLJ.

Solution

To solve the problem in the image, let's analyze the geometry and use the midsegment theorem:

Problem Analysis

The triangle JKLJKL is formed by connecting the midpoints of the sides of triangle GHIGHI.
The midsegment theorem states that:

  1. A midsegment in a triangle is parallel to the third side of the triangle.
  2. The midsegment divides the triangle into two smaller triangles that are similar to the original triangle.

Steps to Solve

  1. Identify GLJ\angle GLJ: We are tasked with finding the measure of GLJ\angle GLJ.
    By examining the angles provided:

    • In GHI\triangle GHI:
      • G=46\angle G = 46^\circ
      • H=97\angle H = 97^\circ
      • I=37\angle I = 37^\circ
    • The midsegment divides GHI\triangle GHI such that corresponding angles in JKL\triangle JKL are the same as in GHI\triangle GHI due to similarity.
  2. Use the Triangle Sum Property:

    • The sum of angles in a triangle is 180180^\circ. For GHI\triangle GHI, we verify: G+H+I=46+97+37=180\angle G + \angle H + \angle I = 46^\circ + 97^\circ + 37^\circ = 180^\circ
  3. Corresponding Angles in JKL\triangle JKL:

    • Since JKLJKL is similar to GHIGHI, the angles in JKLJKL correspond directly to the angles in GHIGHI:
      • GLJ=G=46\angle GLJ = \angle G = 46^\circ.

Final Answer:

mGLJ=46m\angle GLJ = 46^\circ

Would you like further clarification or assistance with similar problems?


Related Questions:

  1. Why does the midsegment theorem ensure similarity between triangles?
  2. How can you prove that a midsegment is parallel to the third side of the triangle?
  3. What are some other properties of midsegments in triangles?
  4. Can you find the lengths of the sides of JKL\triangle JKL given the dimensions of GHI\triangle GHI?
  5. How does the triangle sum property relate to midsegment problems?

Tip:

When working with similar triangles, always look for corresponding angles and use proportionality for sides if needed!

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Math Problem Analysis

Mathematical Concepts

Geometry
Triangle Midsegment Theorem
Similarity of Triangles
Angle Sum Property

Formulas

Sum of angles in a triangle = 180°

Theorems

Midsegment Theorem
Triangle Sum Property

Suitable Grade Level

Grades 8-10