Fold a paper heart down the middle and a seven-year-old will gasp when the two sides land on top of each other. That small surprise is what symmetry is about. This 2nd grade is it a line of symmetry worksheet asks the same question without scissors. Eight figures, from a red heart and a little house to a kite, a triangle and a trapezoid, each carry a dotted line. A note at the top explains that a line of symmetry cuts a shape into two exact halves. For each figure, your child ticks Yes or No. A second page gives the answer key.