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Verified answer
R = 10 cmt = 5 cm
π = 3,14
s² = r² + t²
s² = 10² + 5²
s² = 100 + 25
s = √125
s = 5√5 cm
Lp = π . r . (r + s)
Lp = 3,14 . 10 . (10 + 5√5)
Lp = 31,4 . (10 + 5√5)
Lp = (314 + 157√5) cm²