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=2x22/7x7
= 44
3) K = 2r
=2x22/7x21
=44x3
=132
L = r²
=22/7x21x21
=22x3x21
=1386
r = 7
Keliling = 2πr
= 2x 22/7 x7
= 44cm
Luas = πr² = 22/7 x 7x7 = 154cm²
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2. D = 10,5cm
Keliling = πD = 22/7x10,5 =33 cm
Luas= 1/4πD² = 1/4x 22/7 x 10,5x10,5 =86,625cm²
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3. r= 21cm
Keliling = 2πr = 2x22/7x21= 132cm
Luas = πr² = 22/7 x 21x21 = 1.386cm²
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4. r = 15cm
Luas = πr² =3.14 x 15x15 =706,5cm²
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5. r = 15
Luas 1 triplek = πr²
= 3,14 x 15 x15
= 706,5 cm²
Luas 8 triplek = 8buah x 706,5cm²
=5.625cm²