а) S = 1/2 * d₁ * d₂ * sinα = 1/2 * 15 * 8 * sin30° = 1/2 * 15 * 8 * 1/2 = 30.
б)
в) S = (2 + 3) * 4 = 24.
Ответ: 30; 54; 24.
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а) S = 1/2 * d₁ * d₂ * sinα = 1/2 * 15 * 8 * sin30° = 1/2 * 15 * 8 * 1/2 = 30.
б)
в) S = (2 + 3) * 4 = 24.
Ответ: 30; 54; 24.