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02.12.2019 •
Mathematics
If quadrilateral abcd is an isosceles trapezoid, which statements must be true? check all that apply.
bc ∥ ad
bd ⊥ ac
ba ≅ cd
be ≅ ed
∠cba ≅ ∠bcd
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Ответ:
first, we consider the trapezoid,ABCD
trapezoid must have two parallel lines, as we see on the graph, BC ∥ AD
so the first choice is true, plus BA ≅ CD
BD ⊥ AC is not true, in fact BD and AC are two secant lines
let's consider BEC triangle, it is an isosceles, so
BE ≅ EC, and ∠CBE ≅ ∠ECB
as for AED triangle, it is also an isosceles
AE ≅ ED, and ∠EAD ≅ ∠EDA
finally the true answers are
BC ∥ AD
BA ≅ CD
Ответ: