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12.09 Using triangle congruence

Interactive practice questions

It is known that $\triangle PQR\equiv\triangle STU$PQRSTU.

Two triangles $\triangle PQR$PQR and $\triangle STU$STU are congruent. In triangle $\triangle PQR$PQR, $\angle QPR$QPR at vertex $P$P is marked with a double arc and is shaded blue, and $\angle PRQ$PRQ at vertex $R$R is marked with a single arc and is shaded yellow. In triangle $\triangle STU$STU$\angle UST$UST at vertex $S$S is marked with a double arc and is shaded blue, and $\angle SUT$SUT at vertex $U$U is marked with a single arc and is shaded yellow. Angles $\angle QPR$QPR and $\angle UST$UST are congruent as indicated by their identical marks. Angles $\angle PRQ$PRQ and $\angle SUT$SUT are congruent as indicated by their identical marks. Side $QR$QR is opposite angle $\angle QPR$QPR. Side $PQ$PQ is opposite $\angle PRQ$PRQ. Side $UT$UT is opposite $\angle UST$UST. Side $ST$ST is opposite $\angle SUT$SUT

Which two of the following equalities do we know to be true?

$QR=ST$QR=ST

A

$PQ=TU$PQ=TU

B

$QR=TU$QR=TU

C

$PQ=ST$PQ=ST

D
Easy
< 1min

It is known that $\triangle CDE\equiv\triangle LMN$CDELMN.

Easy
1min

It is known that $\triangle GHI\equiv\triangle LMN$GHILMN.

Easy
< 1min

It is known that $\triangle STU\equiv\triangle ABC$STUABC.

Easy
< 1min
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MA4-17MG

classifies, describes and uses the properties of triangles and quadrilaterals, and determines congruent triangles to find unknown side lengths and angles

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