Answer:
Shape No.1 = 12*16 = 192cm
Shape No.2 = (12*12=144) + [{(16-12=4)*12cm}/2=24] = 168cm
Shape No.3 = 12*13 = 156cm
Explanation:
Shape No.1 is a parallelogram, which can be calculated like 2 triangles, or 1 rectangle.
Shape No2 is a square and a triangle, so we calculate those areas separately and then add them together.
Shape No.3 is also a parallelogram.