The same
not always but they can be
A regular decagon has 10 equal sides.
An isosceles triangle fits the given description
Yes
The same
not always but they can be
No, it is a conguent shape
Yes.
It has 12 congruent edges
No but they are both 4 sided quadrilaterals
A regular decagon has 10 equal sides.
No. SSA can give rise to a pair of non-congruent triangles.
An isosceles triangle fits the given description
Yes
Normally none unless it is an isosceles trapezoid then it has 2 sides of equal length
Re-check your question because the degrees of the angles cannot be the numbers given.