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Mathematics 14 Online
OpenStudy (leahhhmorgannn):

An isosceles trapezoid is a quadrilateral with two congruent legs, a pair of parallel bases, and congruent base angles. Prove the diagonals of an isosceles trapezoid are congruent. Be sure to create and name the appropriate geometric figures. This figure does not need to be submitted.

OpenStudy (leahhhmorgannn):

@AlexandervonHumboldt2

OpenStudy (alexandervonhumboldt2):

|dw:1448412716215:dw|

OpenStudy (alexandervonhumboldt2):

|dw:1448412761219:dw|

OpenStudy (alexandervonhumboldt2):

Prove the diagonals of an isosceles trapezoid are congruent. easy: AD=BC |dw:1448412788901:dw|

OpenStudy (alexandervonhumboldt2):

AD=BC <D=<C DC=DC thus the triangle ADC=BDC, thus AC=BD

OpenStudy (leahhhmorgannn):

AD=BC by what property? like what's the reasons for all of this?

OpenStudy (alexandervonhumboldt2):

AD=BC because it is given

OpenStudy (leahhhmorgannn):

sorry if that's a silly question, I just don't want to possibly leave anything out that could get me points marked off

OpenStudy (alexandervonhumboldt2):

it is because it is the issoceles trapeziod

OpenStudy (alexandervonhumboldt2):

<D=<C because it is given.

OpenStudy (alexandervonhumboldt2):

DC=DC reflexive property

OpenStudy (alexandervonhumboldt2):

then we use SAS

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