Possible Clues:

• Triangle that has two sides of equal length
• Pole loses ice, melting first
• I help with church lesson, issue lost on some figure
• One has unexpected closeness, no win ultimately, having two sides equal
• Word from the Greek for ''equal-legged''
• Is old, old tennis player (about a hundred) descriptive of some figure?
• All the same, only two of three sides
• (Of triangles) having two sides the same
• Like the figure formed by the three circled letters in the upper right
• (of a triangle) having two sides of equal length