Crossword Clue:

TRILATERAL a figure with three sides

AnswerCrossword Clue
DECAGONFigure with 14-Down sides
SCALENEUnequal on all three sides
SOLIDThree-dimensional figure
ISOSCELESLike the figure formed by the three circled letters in the upper right
SCALENELike the figure formed by the three circled letters in the upper left