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L.arsir = (39+21).12/2 - (26+14).8/2
= 360 - 160
= 200 cm²...........opsi D
27. 180° = 60° + (180°-3x-5°) + (180°-4x+10)
180° = 425° - 7x
7x = 245°
x = 35°
∠ABC = 180° - 4x+10°
= 180° - 140° + 10°
= 50°...........opsi A