Find the area of the sweep of a rectangular parallelepiped with measurements of 2.64 m 8 dm 35 cm.

Let’s translate the length of measurements in meters. 8 dm = 0.8 m; 35 cm = 0.35 m.
The unfolded area of a rectangular parallelepiped is the total surface area. It consists of two areas of the bases (upper and lower), of two areas of the side edges and two areas of the front and rear edges.
S = (S1 + S2 + S3);
S1 = 2.64 * 0.8 = 2.112 (m ^ 2);
S2 = 2.64 * 0.35 = 0.924 (m ^ 2);
S3 = 0.35 * 0.8 = 0.28 (m ^ 2);
S = 2 (2.112 + 0.924 + 0.28) = 2 * 3.316 = 6.632 (m ^ 2).
Answer. 6.632 m ^ 2.