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Which pair of triangles can be proven congruent by SAS?

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To determine which pair of triangles can be proven congruent using the Side-Angle-Side (SAS) theorem, we need to check for:

  1. Two pairs of corresponding sides that are equal.

  2. The included angle (the angle between the two given sides) that is also equal.

Now, let’s analyze each option in the image:

  1. Top-left: Shows a triangle with two sides marked and an angle between them. This could be a candidate for SAS.

  2. Top-right: Two triangles are given, but they only show sides, not an included angle. So, they don’t satisfy SAS.

  3. Bottom-left: A large triangle with a right angle and two marked sides. The right angle is the included angle between the sides, so this could be SAS.

  4. Bottom-right: A quadrilateral split into two triangles with equal sides marked. However, without a clearly marked included angle, SAS cannot be confirmed.

Answer:

The bottom-left and top-left pairs of triangles can be proven congruent using SAS because they have two pairs of equal sides and a clearly marked included angle.