Respuesta :
A valid reason is :opposite sides of a parallelogram are equal
Step-by-step explanation:
It is possible to notice that RUTS is a parallelogram where RU=TS and RS = UT.
When you introduce a diagonal RT you form triangles RUT and TSR.
∠URT = ∠STR ----alternate angles
∠UTR=∠SRT------alternate angles
RU║ST and RS║UT
RT=TR -----Common
ΔRUT ≡ ΔTSR by AAS theorem
hence RS=UT matching sides of congruent triangles
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Properties of a parallelogram : https://brainly.com/question/12780093
Keywords : proof, parallelogram, reason
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Answer:
opposite sides of a parallelogram are equal
Step-by-step explanation:
got it right on odyssey