Question

in figure De is parallel to BC d is equal to 3 cm and BC is equal to 9 cm and area of triangle a b is equal to 30 cm square find area of trapezium ABCD

Answer 1

.An illustration of the helium atom, depicting the nucleus (pink) and the electron cloud distribution (black). The nucleus (upper right) in helium-4 is in reality spherically symmetric and closely resembles the electron cloud, although for more complicated nuclei this is not always the case. The black bar is one angstrom (10−10 m or 100 pm).mumtho I de9