Triangle Congruence Proofs Vocab

If L is the midpoint of TJ, what must be true?

• TL=JT
• JL=TJ
• TL=LJ
• T is also the midpoint of JL

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CCSS.HSG.CO.C.10

CCSS.HSG.GPE.B.6

If DA bisects IE, then

• ID=ED
• IA=EA
• <IDA=<EDA
• <IAD and <EAD are right angles

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CCSS.HSG.CO.B.7

CCSS.HSG.CO.B.8

CCSS.HSG.CO.C.10

CCSS.HSG.CO.C.9

CCSS.HSG.SRT.B.5

If AD bisects <EDI, then

• <ADE=<IDA
• IA=AE
• ID=ED
• All of the above

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CCSS.HSG.CO.B.6

CCSS.HSG.CO.B.7

CCSS.HSG.CO.B.8

CCSS.HSG.CO.C.10

CCSS.HSG.SRT.B.5

If DA is perpendicular to IE, then we can immediately conclude that

• IA=AE
• <IAD = <DAE
• <IDA=<EDA
• <IAD and <DAE are right angles

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CCSS.HSG.CO.A.1

CCSS.HSG.CO.C.10

CCSS.HSG.CO.C.9

If DA bisects EI, then

• <IDA = <EDA
• AI=EA
• Both 1 and 2 are correct
• DI=ED

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CCSS.HSG.CO.B.6

CCSS.HSG.CO.B.7

CCSS.HSG.CO.B.8

CCSS.HSG.CO.C.10

CCSS.HSG.SRT.B.5

If DA is the perpendicular bisector or EI, then

• <IAD and <DAE are right angles
• DI=DE
• EA=IA
• Both 1 and 3 are correct

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CCSS.HSG.CO.C.10

CCSS.HSG.CO.C.9

An angle bisector cuts an angle into two congruent _________

• Angles!
• Segments
• Mysteries

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CCSS.HSG.CO.D.12

A segment bisector cuts a segment into two congruent

• Segments!
• Angles
• Mysteries

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CCSS.HSG.CO.D.12

In this picture, we know for sure that

• <TEB=<ETS
• <BTE=<SET
• BE=ST
• Both 1 and 2 are correct

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CCSS.HSG.CO.B.6

CCSS.HSG.CO.C.11

In this picture,

• <BCA=<DCE because they are vertical angles and vertical angles are always congruent to each other
• <C=<C because they are vertical angles and vertical angles are always congruent to each other
• <EDC=<ACB because they are vertical angles and vertical angles are always congruent to each other
• None of the above; we don't actually have vertical angles

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CCSS.HSG.CO.C.9