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r = 1/2 · 40 = 20 cm
maka lebar persegi panjang,
l = 35 - 20 = 15 cm
Sehingga
L = 1/2 · L O + Lpp
= 1/2 · πr² + p · l
= 1/2 · 3,14 · 20 · 20 + 40 · 15
= 628 + 600
= 1.228 cm²
Jawab : B
Nomer 7
r = 1/2 · 70 = 35 cm
maka
L = 1/2 · πr²
= 1/2 · 22/7 · 35 · 35
= 11 · 5 · 35
= 1.925 cm²
Jawab : D
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