tolong bantu ya no 5

semoga membantu. mhon maaf berantakan

luas segitiga
=1/2×a×t
=1/2×(12+2√5)×(12-2√5)
=1/2×(12^2-2^2√5^2
=1/2×144-(4×5)
=1/2×144-20
=62