not always but they can be
A regular decagon has 10 equal sides.
Yes
An isosceles triangle fits the given description
Normally none unless it is an isosceles trapezoid then it has 2 sides of equal length
not always but they can be
No, it is a conguent shape
It has 12 congruent edges
Yes.
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.
Yes
An isosceles triangle fits the given description
Normally none unless it is an isosceles trapezoid then it has 2 sides of equal length
Side Side Side when comparing two triangles the side side side postulate states that if three sides from one triangle are congruent to three sides on another triangle the triangles are conguent
Re-check your question because the degrees of the angles cannot be the numbers given.