Easy Medium Hard Extreme Add 4 matchsticks to divide the triangle into 3 equal parts. The 3 parts may differ in shape but must be equal in size. Show Answer If the length of 1 matchstick is 1 unit, the size of the big triangle (A + B + C + D) is: = 1/2 X 4 X 3 = 6 square units The size of rectangle A is: = 2 X 1 = 2 square units The size of triangle B is: = 1/2 X 1 X 2 = 1 square unit But C = B based on the same calculation which results in B + C = 2 square units. Size of part D is: = Big triangle - size A - size B - size C = 6 - 2 - 1 - 1 = 2 square units It should be clear that A = D = (B + C) Hide Answer