Penjelasan dengan langkah-langkah:
i. keliling persegi panjang = 2 (p+l)
= 2 (28+14)
= 2(42)
= 84 cm
diameter lingkaran = 14
r = 7
keliling lingkaran =
[tex]2\pi \: r[/tex]
= 2 x 22/7 x 7
= 44 cm
keliling daerah yang diarsir = k persegi panjang- k lingkaran
= 84-44
= 40 cm
luas persegi panjang = p x l
= 28 x 14
= 392 cm^2
luas lingkaran =
[tex]\pi {r}^{2} [/tex]
= 22/7 x 7 x7
= 154 cm^2
luas daerah yang diarsir = 392 - 154
= 238 cm^2
ii. r = 10 cm
k 1/4 lingkaran =
[tex] \frac{1}{4} \times 2\pi \: r[/tex]
= 1/4 x 2 x 3,14 x 10
= 15,7 cm
luas 1/4 lingkaran =
[tex] \frac{1}{4} \times \pi \: {r}^{2} [/tex]
= 1/4 x 3,14 x 10 x 10
= 78,5 cm^2
iii. keliling persegi = 21 + 21 +21 +21
k 1/2 lingkaran =
[tex] \frac{1}{2} \times 2\pi \: r[/tex]
= 1/2 x 2 x 22/7 x 21/2
= 33 cm
keliling daerah yg diarsir = k persegi + k lingkaran
= 84 + 33
= 51 cm
luas persegi = s x s
= 21 x 21
= 441 cm^2
luas 1/2 lingkaran =
[tex] \frac{1}{2} \times \pi {r}^{2} [/tex]
= 1/2 x 22/7 x 21/2 x 21/2
= 173,25 cm^2
=267,75 cm^2
iv. k 1/2 lingkaran besar = 1/2 x 2 x 3,14x 10
= 31,4 cm
k 1/2 lingkaran kecil yang diarsir = 1/2 x 2 x 3,14x 5
k 1/2 lingkaran kecil yg tidak diarsir = 1/2 x 2x3,14x5
= 15,7
k yg diarsir = 31,4-15,7+15,7
luas 1/2 lingkaran = 1/2 x 3,14 x 10 X10
= 157 cm^2
luas 1/2 lingkaran yg diarsir = 1/2 x 3,14x5x5
= 39,25
luas 1/2 lingkaran yg TDK diarsir = 39,25
luas yg diarsir = 157-39,25+39,25
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Penjelasan dengan langkah-langkah:
i. keliling persegi panjang = 2 (p+l)
= 2 (28+14)
= 2(42)
= 84 cm
diameter lingkaran = 14
r = 7
keliling lingkaran =
[tex]2\pi \: r[/tex]
= 2 x 22/7 x 7
= 44 cm
keliling daerah yang diarsir = k persegi panjang- k lingkaran
= 84-44
= 40 cm
luas persegi panjang = p x l
= 28 x 14
= 392 cm^2
luas lingkaran =
[tex]\pi {r}^{2} [/tex]
= 22/7 x 7 x7
= 154 cm^2
luas daerah yang diarsir = 392 - 154
= 238 cm^2
ii. r = 10 cm
k 1/4 lingkaran =
[tex] \frac{1}{4} \times 2\pi \: r[/tex]
= 1/4 x 2 x 3,14 x 10
= 15,7 cm
luas 1/4 lingkaran =
[tex] \frac{1}{4} \times \pi \: {r}^{2} [/tex]
= 1/4 x 3,14 x 10 x 10
= 78,5 cm^2
iii. keliling persegi = 21 + 21 +21 +21
= 84 cm
k 1/2 lingkaran =
[tex] \frac{1}{2} \times 2\pi \: r[/tex]
= 1/2 x 2 x 22/7 x 21/2
= 33 cm
keliling daerah yg diarsir = k persegi + k lingkaran
= 84 + 33
= 51 cm
luas persegi = s x s
= 21 x 21
= 441 cm^2
luas 1/2 lingkaran =
[tex] \frac{1}{2} \times \pi {r}^{2} [/tex]
= 1/2 x 22/7 x 21/2 x 21/2
= 173,25 cm^2
=267,75 cm^2
iv. k 1/2 lingkaran besar = 1/2 x 2 x 3,14x 10
= 31,4 cm
k 1/2 lingkaran kecil yang diarsir = 1/2 x 2 x 3,14x 5
= 15,7 cm
k 1/2 lingkaran kecil yg tidak diarsir = 1/2 x 2x3,14x5
= 15,7
k yg diarsir = 31,4-15,7+15,7
= 31,4 cm
luas 1/2 lingkaran = 1/2 x 3,14 x 10 X10
= 157 cm^2
luas 1/2 lingkaran yg diarsir = 1/2 x 3,14x5x5
= 39,25
luas 1/2 lingkaran yg TDK diarsir = 39,25
luas yg diarsir = 157-39,25+39,25
= 157 cm^2