Tolong di bantu jawab nomer 16,17,18

no 16) nilai x = 2x + 3x +30° = 180
5x = 180 - 30
5x. = 150
x. = 150 ÷ 5
x = 30

∆ABD = 30 +(3×30)
= 30+30 = 90° (b)

no 17) ∆CFE = 180° - 110° = 70° (b)

maaf cuman bisa no 16 & 17
semoga membantu