48 cm2
The area of the top right triangle ½ × 8 × 8 = 32 cm2.
The area of the top left triangle is ½ × 5 × 7 = 17.5 cm2.
The area of the bottom triangle is½ × 15 × 3 = 22.5 cm2.
The area of the rectangle is 15 × 8 = 120 cm2.
So the area of the shaded triangle is 120 - 32 - 17.5 - 22.5 = 48 cm2.
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