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=2×22/7×7×10
=440cm²
Lp=2×π×r(r+t)
=2×22/7×7(7+10)
=748cm²
= 2 . 22/7 . 7 . 10
= 440
2. Lp = 2 . phi . r2 + 2 . phi . r . t
= 2 . 22/7 . 7 . 7 + 2 . 22/7 . 7 . 10
= 308 + 440
= 748