''Penta'' means Five, so a polygon which have 5 Angles, 5 Sides and 5 Vertices is known as Pentagon.
In the Above diagram :-
Pentagon ABCDE has
5 Sides - AB, BC, CD, DE and EA
5 Angles - ABC, BCD, CDE, DEA and EAB
5 Vertices - A, B, C, D and E
In the Above diagram :-
Pentagon PQRST has
5 Sides - PQ, QR, RS, ST and TP
5 Angles - PQR, QRS, RST, STP and TPQ
5 Vertices - P, Q, R, S and T
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