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a. how many different triangles are in \\( \\triangle mbc \\)? b. if \\…

Question

a. how many different triangles are in \\( \triangle mbc \\)?
b. if \\( \triangle bry \cong \triangle crx \\), then complete the
congruence statement.
\\( \overline { r c } \cong \\) \\( \angle r y b \cong \\)
c. if \\( \triangle b x m \cong \triangle c y m \\), then complete the
congruence statement.
\\( \overline { c y } \cong \\) \\( \overline { c m } \cong \\) \\( \angle m c y \cong \\)

Explanation:

a. Counting Triangles

  • Step1: Identify Smallest Triangles
  • Triangles like \( \triangle BRY\), \( \triangle CRX\), \( \triangle BRX\), \( \triangle CRY\)
  • Step2: Identify Medium - sized Triangles
  • Triangles like \( \triangle BXM\), \( \triangle CYM\), \( \triangle BRC\)
  • Step3: Identify the Largest Triangle
  • \( \triangle MBC\) itself

b. Congruent Triangles (\( \triangle BRY\cong\triangle CRX\))

  • Step1: Corresponding Sides
  • Since \( \triangle BRY\cong\triangle CRX\), by CPCTC (Corresponding Parts of Congruent Triangles are Congruent), \( \overline{RC}\cong\overline{RB}\)
  • Step2: Corresponding Angles
  • \( \angle RYB\cong\angle RXC\)

c. Congruent Triangles (\( \triangle BXM\cong\triangle CYM\))

  • Step1: Corresponding Sides
  • \( \overline{CY}\cong\overline{BX}\) (CPCTC)
  • \( \overline{CM}\cong\overline{BM}\) (CPCTC)
  • Step2: Corresponding Angles
  • \( \angle MCY\cong\angle MBX\) (CPCTC)

Answer:

a. \( 8\)
b. \( \overline{RB}\), \( \angle RXC\)
c. \( \overline{BX}\), \( \overline{BM}\), \( \angle MBX\)