Theorem 20: If Two Sides Of A Triangle Are Congruent, The .

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Theorem 20: If two sides of atriangle are congruent, the anglesopposite the sides are congruent.( If , then . )

Theorem 20: If two sides of a triangle are congruent, theangles opposite the sides are congruent. ( If , then . )Given: AB ACProve:AB CBProofStatementCReason

Theorem 20: If two sides of a triangle are congruent, theangles opposite the sides are congruent. ( If , then . )Given: AB ACProve:AB CBProofStatementCReason

Theorem 20: If two sides of a triangle are congruent, theangles opposite the sides are congruent. ( If , then . )Given: AB ACProve:AAB CBProofStatementCCReasonB

Theorem 20: If two sides of a triangle are congruent, theangles opposite the sides are congruent. ( If , then . )Given: AB ACProve:AAB CBProofStatementCCReasonB

Theorem 20: If two sides of a triangle are congruent, theangles opposite the sides are congruent. ( If , then . )Given: AB ACProve:AAB CBProofStatement1. AB ACCCReason1. GivenB

Theorem 20: If two sides of a triangle are congruent, theangles opposite the sides are congruent. ( If , then . )Given: AB ACProve:AAB CBProofStatement1. AB AC2. BC BCCCReason1. Given2. Ref.B

Theorem 20: If two sides of a triangle are congruent, theangles opposite the sides are congruent. ( If , then . )Given: AB ACProve:AAB CBProofStatement1. AB AC2. BC BC3. ABC ACBCCReason1. Given2. Ref.3. SSSB

Theorem 20: If two sides of a triangle are congruent, theangles opposite the sides are congruent. ( If , then . )Given: AB ACProve:AAB CBProofStatement1. AB AC2. BC BC3. ABC ACB4. B CCCReason1. Given2. Ref.3. SSS4. CPCTCB

Theorem 21: If two angles of atriangle are congruent, the sidesopposite the angles are congruent.( If , then . )

Theorem 21: If two angles of a triangle are congruent, thesides opposite the angles are congruent. (If , then .) CProve: AB ACGiven:ABBProofStatementCReason

Theorem 21: If two angles of a triangle are congruent, thesides opposite the angles are congruent. (If , then .) CProve: AB ACGiven:ABBProofStatement1. B C2. BC BC3. ABC ACB4. AB ACACCReason1. Given2. Ref.3. ASA4. CPCTCB

The two theorems tell us:If at least two sides of a triangle arecongruent, the triangle is isosceles.If at least two angles of a triangleare congruent, the triangle isisosceles.

Theorem 20: If two sides of a triangle arecongruent, the angles opposite the sides arecongruent. ( If , then . )The inverse of Theorem 20 is true:If two sides of a triangle are not congruent, thenthe angles opposite them are not congruent, andthe larger angle is opposite the longer side.( If , then . )

Theorem 21: If two angles of a triangle arecongruent, the sides opposite the angles arecongruent. (If , then .)The inverse of Theorem 21 is true:If two angles of a triangle are not congruent,then the sides opposite them are not congruent,and the longer side is opposite the larger angle.( If , then . )

The median to the base of anisosceles triangle bisects the vertexangle.

The median to the base of an isosceles triangle bisects thevertex angle.AGiven: Isosceles ABCwith vertex A andmedian ADProve:ProofBAD CADStatementBReasonDC

The median to the base of an isosceles triangle bisects thevertex angle.AGiven: Isosceles ABCwith vertex A andmedian ADProve:ProofBAD CADStatementBReasonDC

The median to the base of an isosceles triangle bisects thevertex angle.AGiven: Isosceles ABCwith vertex A andmedian ADProve:ProofBAD CADStatementBReasonDC

The median to the base of an isosceles triangle bisects thevertex angle.AGiven: Isosceles ABCwith vertex A andmedian ADProve:ProofBAD CADStatementBReasonDC

The median to the base of an isosceles triangle bisects thevertex angle.AGiven: Isosceles ABCwith vertex A andmedian ADProve:ProofBAD CADStatement1. Isosceles ABCwith vertex ABReason1. GivenDC

The median to the base of an isosceles triangle bisects thevertex angle.AGiven: Isosceles ABCwith vertex A andmedian ADProve:ProofBAD CADStatement1. Isosceles ABCwith vertex AS 2. AB ACBDCReason1. Given2. Legs of isos.are .

The median to the base of an isosceles triangle bisects thevertex angle.AGiven: Isosceles ABCwith vertex A andmedian ADProve:ProofBAD CADStatement1. Isosceles ABCwith vertex AS 2. AB ACA 3. B CBDCReason1. Given2. Legs of isos.3. If , then .are .

The median to the base of an isosceles triangle bisects thevertex angle.AGiven: Isosceles ABCwith vertex A andmedian ADProve:ProofBAD CADStatement1. Isosceles ABCwith vertex AS 2. AB ACA 3. B C4. AD is a medianBDCReason1. Given2. Legs of isos.3. If , then .4. Givenare .

The median to the base of an isosceles triangle bisects thevertex angle.AGiven: Isosceles ABCwith vertex A andmedian ADProve:ProofBAD CADStatement1. Isosceles ABCwith vertex AS 2. AB ACA 3. B C4. AD is a median5. D is mdpnt. of ADBDCReason1. Given2. Legs of isos. are .3. If , then .4. Given5. Def. of median

The median to the base of an isosceles triangle bisects thevertex angle.AGiven: Isosceles ABCwith vertex A andmedian ADProve:ProofBAD CADStatement1. Isosceles ABCwith vertex AS 2. AB ACA 3. B C4. AD is a median5. D is mdpnt. of ADS 6. BD CDBDCReason1. Given2. Legs of isos. are .3. If , then .4. Given5. Def. of median6. Def. of midpoint

The median to the base of an isosceles triangle bisects thevertex angle.AGiven: Isosceles ABCwith vertex A andmedian ADProve:ProofBAD CADStatement1. Isosceles ABCwith vertex AS 2. AB ACA 3. B C4. AD is a median5. D is mdpnt. of ADS 6. BD CD7. ABD ACDBDCReason1. Given2. Legs of isos. are .3. If , then .4. Given5. Def. of median6. Def. of midpoint7. SAS

The median to the base of an isosceles triangle bisects thevertex angle.AGiven: Isosceles ABCwith vertex A andmedian ADProve:ProofBAD CADStatement1. Isosceles ABCwith vertex AS 2. AB ACA 3. B C4. AD is a median5. D is mdpnt. of ADS 6. BD CD7. ABD ACD8. BAD CADBDCReason1. Given2. Legs of isos. are .3. If , then .4. Given5. Def. of median6. Def. of midpoint7. SAS8. CPCTC

Theorem 20: If two sides of atriangle are congruent, the anglesopposite the sides are congruent.( If , then . )

Theorem 20: If two sides of atriangle are congruent, the anglesopposite the sides are congruent.( If , then . )Theorem 21: If two angles of atriangle are congruent, the sidesopposite the angles are congruent.( If , then . )

Theorem 20: If two sides of a triangle are congruent, the angles opposite the sides are congruent. ( I f , th e n .) The inverse of Theorem 20 is true: If two sides of a triangle are not congruent, then the angles opposite them are not congruent, and the lar

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