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km liat gambar biar jelas
tarik garis tinggi dari T ke grs AB tegak lurus
luas sisi tegak = 4x luas TAB
cari luas TAB dulu
segitiga APT siku2 di P
AP = 10, AT = 26 maka AP² + PT² = AT²
100 + PT² = 676
PT² = 576, PT = √576 = 24
luas ABT = 1/2 alas x tinggi = 1/2 x 20 x 24 = 240
luas total = 4x 240 = 960 jawaban D