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Объяснение:
SPAMSPAM SwiftKey SwiftKey SwiftKey SwiftKey SwiftKey SwiftKey SwiftKey SwiftKey SwiftKey SwiftKey SwiftKey SwiftKey SwiftKey SwiftKey SwiftKey SwiftKey SwiftKey SwiftKey SwiftKey SwiftKey SwiftKey SwiftKey SwiftKey SwiftKey SwiftKey SwiftKey
Радиус окружности, вписанной в равносторонний треугольник, равен:
r = a /(2√3).
Площадь окружности равна:
S = πr² = π*( a /(2√3))² = πa² / 12 = π*6² / 12 = π*36 / 12 = 3π.