Знайдіть площу ромба за його стороною а і кутом 30°​

сторона навпроти кута 30°= половині гіпотенузи, дай мені величини які є в задачі і я розвяжу

2)    By the time Humphry Davy, the British scientist, discovered the voltaic arc in 1811, the
electric arc had been already discovered by Russian scientist V. Petrov on November 23.
1802, but his discovery remained unknown in the West.
3)    In 1877, Thomas Edison improved and later patented the lamp which had been made
by Alexander Lodygin, a young Russian engineer, in 1873
4)    In 1886, K..E. Tsiolkovsky modified an all-metal dirigible, the idea of which had been
put forward by   Mendeleyev in  1875.
5)    By the time two Americans Orville and Wilbur Wright built an aeroplane in 1Э03 the first
aircraft had been already designed by Mozhaisky in 1878 and tested on August 1, 1882.
6)    In 1829, in Russia the Chetepanovs, father and son, improved a steam locomotive which
had been invented by George Stephenson in 1814.