Jawab:
K = 54 m
L = 17.325 cm²
Penjelasan dengan langkah-langkah:
π = [tex]\frac{22}{7}[/tex]atau 3,14
r = jari-jari ---> setengahnya diameter
d = diameter
Diketahui:
- d = 21 m ---> maka r = 21/2 = 10,5 m
Sehingga diperoleh:
Keliling setengah lingkaran
= [tex]\frac{1}{2}[/tex] × 2 × π × r + d
= [tex]\frac{1}{2}[/tex] × 2 × 22/7 × 10,5 + 21
= (1 × 2 × 22 × 10,5)/(2 × 7) + 21
= [tex]\frac{462}{14}[/tex] + 21
= 33 + 21
= 54 m
diameter = 21 dm
= (21 × 10) cm
= 210 cm
jari-jari = 210 cm : 2
= 105 cm
Luas 1/2 lingkaran = [tex]\frac{1}{2}[/tex] × π × r × r
= [tex]\frac{1}{2}[/tex] × [tex]\frac{22}{7}[/tex] × 105 × 105 cm²
= 11 × 15 × 105 cm²
= 17.325 cm²
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