ВН = √ 40² - (20√3)² = 20
соsB = 20/40 = 0,5 ∠B = 60°
S = 1/2* 10√3 *10 *sin 60° = 75
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ВН = √ 40² - (20√3)² = 20
соsB = 20/40 = 0,5 ∠B = 60°
S = 1/2* 10√3 *10 *sin 60° = 75