The orthohedron is a figure with six faces similar to the cube, but with the rectangular faces (two rectangles as sides $$a$$ and $$b$$, two as sides $$a$$ and $$c$$, and two as sides $$c$$ and $$b$$)
The diagonal $$D$$ will be also obtained by applying Pythagoras twice: $$$D=\sqrt{a^2+b^2+c^2}$$$
The area and volume will be: $$$A=2(ab+ac+bc) \\ V=a \cdot b \cdot c$$$