Please help me.. I'm failing math. :") Maurice is cutting out shapes for a class project. He has a scrap of green poster board in the shape of a triangle, shown below. He wants to trim the large green triangle into a smaller triangle by cutting along the dotted line shown. If the red segment along the left side of the triangle measures 30 cm and the blue segment along the bottom of the triangle measures 54 cm, what is the length of poster board that Maurice cut? (ATTACHED IMAGE IS THE GIVEN TRIANGLE) A) 10 cm

B) 12 cm

C) 20 cm

D) 18 cm