jawaban nomer 2 apa ya

Look at the picture partly.
Observe the change of its area based on the side.
Area of ACD is half of area of ABCD, hence we get Area of ACD = 60 cm^2. This implied that Area of ADE = AEF = AFG = AGC = 15 cm^2 (which is a quarter region). The shaded region covers up area of AFG and AGC, so we get 30 cm^2.
Now observe another part.
Look at triangle of ABC. Its area is 60 cm^2 and implied that area of ABI = AIH = AHC = 20 cm^2 (which is a one-third region). The shaded region covers up area of AIH and AHC so we get the area = 40 cm^2.
Shaded region area = (30+40)cm^2=70 cm^2