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2. graph \\( \\triangle p q r \\) with vertices \\( p ( - 7, - 4 ), q (…

Question

  1. graph \\( \triangle p q r \\) with vertices \\( p ( - 7, - 4 ), q ( - 4,0 ) \\) and \\( r ( - 1, - 4 ) \\) on the graph provided.

a. rotate \\( \triangle p q r 180 ^ { \circ } \\) about the origin to construct \\( \triangle x y z \\).
b. list the side lengths for all segments.
\\( p q = \\)__ \\( x y = \\)__
\\( q r = \\)__ \\( y z = \\)__
\\( r p = \\)__ \\( z x = \\)__
c. mark the sides that are congruent on the graph. list all sides that are congruent.
\\( \overline { p q } \cong \\)____
\\( \overline { q r } \cong \\)____
\\( \overline { r p } \cong \\)____
e. verify angles are congruent using a protractor. mark the angles that are congruent on the graph. list all angles that are congruent.
\\( \angle p \cong \\)____
\\( \angle q \cong \\)____
\\( \angle r \cong \\)____
e. if all sides and angles of two triangles are congruent, then the two triangles are congruent. therefore,
\\( \triangle \\)__ \\( \cong \triangle \\)__.
for problems 3 - 5, list all congruent parts based on the given congruence statement.

  1. \\( \triangle j k l \cong \triangle m n o \\)

\\( \overline { j k } \cong \\)____
\\( \overline { k l } \cong \\)____
\\( \overline { l j } \cong \\)____
\\( \angle j \cong \\)____
\\( \angle k \cong \\)____
\\( \angle l \cong \\)____

  1. \\( \triangle c a r \cong \triangle b u s \\)

\\( \overline { c a } \cong \\)____
\\( \overline { a r } \cong \\)____
\\( \overline { r c } \cong \\)____
\\( \angle c \cong \\)____
\\( \angle a \cong \\)____
\\( \angle r \cong \\)____

  1. \\( \triangle a r m \cong \triangle l e g \\)

\\( \overline { a r } \cong \\)____
\\( \overline { r m } \cong \\)____
\\( \overline { m a } \cong \\)____
\\( \angle a \cong \\)____
\\( \angle r \cong \\)____
\\( \angle m \cong \\)____

Explanation:

Step1: Distance formula

The distance formula between two points \((x_1,y_1)\) and \((x_2,y_2)\) is \(d = \sqrt{(x_2 - x_1)^2+(y_2 - y_1)^2}\).
For \(PQ\) with \(P(-7,-4)\) and \(Q(-4,0)\):

$$ LATEXBLOCK0 $$

Since rotation is a rigid transformation, \(XY = PQ\). So \(XY=5\).

Step2: For \(QR\) with \(Q(-4,0)\) and \(R(-1,-4)\)

$$ LATEXBLOCK1 $$

Since rotation is a rigid transformation, \(YZ = QR\). So \(YZ = 5\).

Step3: For \(RP\) with \(R(-1,-4)\) and \(P(-7,-4)\)

$$ LATEXBLOCK2 $$

Since rotation is a rigid transformation, \(ZX=RP\). So \(ZX = 6\).

Step4: Congruent sides

Since \(\triangle PQR\) is rotated \(180^{\circ}\) about the origin to get \(\triangle XYZ\) (a rigid transformation), \(\overline{PQ}\cong\overline{XY}\), \(\overline{QR}\cong\overline{YZ}\), \(\overline{RP}\cong\overline{ZX}\).

Step5: Congruent angles

Since rotation is a rigid transformation (preserves angles), \(\angle P\cong\angle X\), \(\angle Q\cong\angle Y\), \(\angle R\cong\angle Z\). And \(\triangle PQR\cong\triangle XYZ\) (by SSS or ASA or AAS since all corresponding sides and angles are congruent).

Step6: Congruent parts for \(\triangle JKL\cong\triangle MNO\)

Corresponding parts: \(\overline{JK}\cong\overline{MN}\), \(\overline{KL}\cong\overline{NO}\), \(\overline{LJ}\cong\overline{OM}\), \(\angle J\cong\angle M\), \(\angle K\cong\angle N\), \(\angle L\cong\angle O\)

Step7: Congruent parts for \(\triangle CAR\cong\triangle BUS\)

Corresponding parts: \(\overline{CA}\cong\overline{BU}\), \(\overline{AR}\cong\overline{US}\), \(\overline{RC}\cong\overline{SB}\), \(\angle C\cong\angle B\), \(\angle A\cong\angle U\), \(\angle R\cong\angle S\)

Step8: Congruent parts for \(\triangle ARM\cong\triangle LEG\)

Corresponding parts: \(\overline{AR}\cong\overline{LE}\), \(\overline{RM}\cong\overline{EG}\), \(\overline{MA}\cong\overline{GL}\), \(\angle A\cong\angle L\), \(\angle R\cong\angle E\), \(\angle M\cong\angle G\)

Answer:

  • \(PQ = 5\), \(XY=5\), \(QR = 5\), \(YZ = 5\), \(RP=6\), \(ZX = 6\)
  • \(\overline{PQ}\cong\overline{XY}\), \(\overline{QR}\cong\overline{YZ}\), \(\overline{RP}\cong\overline{ZX}\)
  • \(\angle P\cong\angle X\), \(\angle Q\cong\angle Y\), \(\angle R\cong\angle Z\), \(\triangle PQR\cong\triangle XYZ\)
  • For \(\triangle JKL\cong\triangle MNO\): \(\overline{JK}\cong\overline{MN}\), \(\overline{KL}\cong\overline{NO}\), \(\overline{LJ}\cong\overline{OM}\), \(\angle J\cong\angle M\), \(\angle K\cong\angle N\), \(\angle L\cong\angle O\)
  • For \(\triangle CAR\cong\triangle BUS\): \(\overline{CA}\cong\overline{BU}\), \(\overline{AR}\cong\overline{US}\), \(\overline{RC}\cong\overline{SB}\), \(\angle C\cong\angle B\), \(\angle A\cong\angle U\), \(\angle R\cong\angle S\)
  • For \(\triangle ARM\cong\triangle LEG\): \(\overline{AR}\cong\overline{LE}\), \(\overline{RM}\cong\overline{EG}\), \(\overline{MA}\cong\overline{GL}\), \(\angle A\cong\angle L\), \(\angle R\cong\angle E\), \(\angle M\cong\angle G\)