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b = 5
P = ¼(a²√3) + ½ b × h
h² = b² - (½a)²
h² = 5² - 1²
h² = 25 - 1
h² = 24
h = √24
h = 2√6
P = ¼(2²√3) + ½ × 5 × 2√6
P = √3 + 5√6