S = 1/2 * a * a sin 60*
S = 1/2 * 4 * 4 * √3/2 = 4√3 (дм²)
или
S = a²√3 / 4
S = 16√3/4 = 4√3 (дм²)
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Verified answer
S = 1/2 * a * a sin 60*
S = 1/2 * 4 * 4 * √3/2 = 4√3 (дм²)
или
S = a²√3 / 4
S = 16√3/4 = 4√3 (дм²)