Find the cost of fencing a circle with radius 7cm at rupees 30per m
1. Find the cost of fencing a circle with radius 7cm at rupees 30per m
Jawab:
6.8₹
Penjelasan dengan langkah-langkah:
circumference of cirle = [tex]2\pi r[/tex]
= 2 x 11/7 x 7 cm
= 22/7 x 7
= 22 cm
fencing cost = 30₹ / m
100 cm = 1m
= (22/100) x 30
= (11/50) x 30
= 330/50
= 33/5
= 6 3/5
= 6.8₹
Given:
Radius : 7cmCost of fencing per metre: 30m²ToFind:-
Cost of fencing with radius: 7cmSolutionwithStepbyStepExplanation:-
Circumference of Circle = 2πr
= 2 × 22/7 × 7
= 44cm
1 m = 1000cm =
so, 1000/44 = 0.44m
Hence, The circumference of Circle is 0.44m
Now, we have to find the Cost of Fencing!
Cost of fencing at m² = 30m²
Cost of fencing at 0.44m = ₹13.2
.°. Cost of Fencing at 0.44m is ₹13.2
2. the area of circle with radius 56 cm is
Question:The are of circle with radius 56 cm is...
Terjemahan:Area lingkaran dengan jari jari 56 Cm adalah...
Answer/Jawaban:
Jika ditanya keliling: (Rumus: 2 x π x r)
> 2 x π x r
> 2 x 22/7 x 56
> 2 x 22 x 8
= 352 Cm ← Answer
Jika ditanya luas: (Rumus: π x r x r)
> π x r x r
> 22/7 x 56 x 56
> 22 x 8 x 56
= 9.856 Cm² ← Answer
Note: 22/7 dibaca 22 per 7.
Semoga Bermanfaatdan Membantu:)
3. the radius of circle with circumference 37,68 cm is .... terimakasih
keliling = 2.phi.r
37,68 = 2 . 3,14 . r
r = 37,68:(2.3,14)
r = 6 cm
4. find the equation of the circle whose radius is 5 which touches the circle x² + y² - 2x -4x -20 = 0
Penjelasan dengan langkah-langkah:
x² + y² - 2x -4y -20 = 0
cari titik pusatnya dulu
x = –(–2)/2 = 1
y = –(–4)/2 = 2
jadi pusatnya (1, 2)
dengan r=5
kita cari titik potongnya
dengan :
(a+1)/2 = 5
a + 1 = 2(5)
a = 10-1
a = 9
(b+2)/2 = 5
b+2 = 2(5)
b = 10-2
b = 8
Persamaannya menjadi :
(x - a)² + (y - b)² = r²
(x - 9)² + (y - 8)² = 5²
x² - 18x + y² - 16y + (-9)² + (-8)² - 5² = 0
x² + y² - 18x - 16y + 81 + 64 - 25 = 0
x² + y² - 18x - 16y + 120 = 05. Find the following. (Use t = 3,14)a The radius of the circle with a diameter of 125 cm.b The area of the circle with a radius of 10,5 cm.c The circumference of the circle with a diameter of 144 cm.PLS BANTU PLS
Jawaban:
A. 10,5 cm
B. 347.,28 cm²
C. 452,16 cm
Penjelasan dengan langkah-langkah:
Point A.
Diameter 125 cm,
[tex]d = 2r \\ 125 = 2r \\ r = \frac{125}{2} \\ = 62.5 \: cm[/tex]
Point B
r = 10.5 cm
[tex]a = \pi {r}^{2} \\ = 3.14 \times 10.5 \times 10.5 \\ = 347.28 \: {cm}^{2} [/tex]
Point C.
d = 144 cm,
[tex]c = \pi .d \\ = 3.14 \times 144 \\ = 452.16 \: cm[/tex]
6. A circle with the diameter of 82 cm. What is its radius? tolong jawab ya
the diameter is 82 cm so radius is 41cm and circumference is 2πr = 2.π.41 = 263.76cm
semoga membantu
7. find the center and radius of the circle with the given equation x^2+2x+10+y^2-6y-10=0
Represent the equation in standard form. x^2 + 2x + 10 + y^2 - 6y - 10 = 0 (x + 1)^2 + (y - 3)^2 - 10 = 0 (x + 1)^2 + (y - 3)^2 = 10 Centre = (-1,3) radius = sqrt(10)
8. The radius of circle with circumference 37,68 cm is ... (use = 3,14)
circumference = keliling lingkaran = 37,68 cm
circumference = π . d
37,68 cm = 3,14 . d
d = 37,68 : 3,14
d = 12 cm
r = 6 cmk = 2 × π × r
37,68 = 2 × 3,14 × r
37,68 = 62,8 × r
r = 37,68 : 62,8
r = 6
9. The radius of circle with circumference 37,68cm is.......(use n=3,14
37,68 cm = 3,14 x 2 x radius
37,68 cm = 6,28 x radius
37,68 : 6,28 = radius
6 cm = radius
10. The radius of circle with curcumference 37,68 cm is a.12 b.10 c.6 d.4
circumference = keliling=37,68cm
radius of circle = jari jari=?
K=2 x π x r
37,68cm= 2 x 3,14 x r
37,68cm=6,28 x r
r= 37,68cm : 6,28
r= 6cm
c. 6 cm
11. 1.The diameter of a circle is 20 m, so the radius is .. 2.The circumference of a circle with the diameter of 14 cm is .... 3.The circumference of a semi circle with the diameter of 14 cm is .... 4.The radius of a circle is 28 cm. The area of a quadrant is ...
Jawab:
1. 10 m
2. 44 cm
3. 36 cm
4. 154 cm²
Penjelasan dengan langkah-langkah:
1. Radius = half diameter = 20 /2 = 10 m
2. Circumference = 2 x 22/7 x 7 cm = 44 cm
3. Circumference = diameter + half circumference = 14 + 22/7 x 7 = 36 cm
4. Area quadrant = 1/4 x 22/7 x 14 x 14 = 154 cm²
12. A circle has an area of M cm2 and a circumference of N cm.if m/n=20,then the radius of circle is cm
Sebuah lingkaran memiliki Arean dari M cm2 dan lingkar N cm. jika m / n = 20, maka jari-jari lingkaran adalah cm
itu artinya
13. The figure shows a quarter circle with radius 7 cm. What is the perimeter of the quarter circle?
r = 7 cm
1/4 p = ( 1/4 x π x 2 x r ) + 2r
(1/2 x 22/7 x 7 cm) + 14 cm
11 cm + 14 cm = 25 cm
14. the perimeter of circle with diameter 20 m is....m
Jawaban:
62,8
Penjelasan dengan langkah-langkah:
k=3,14 dikali 20
k =62,8
15. A circle has a radius of 10,5 meter. The circumference of the circle is
66 m
Penjelasan dengan langkah-langkah:
r = 10,5 m
d = 10,5 x 2 = 21 m
K = πd
= 22/7 x 21 m
= 66 m
16. A circle with diameter of 210 has a radius of … *900420No Answer105.
Jawaban:
diameter= 210
radius= 1/2.diameter
radius=1/2.210
radius=105
Penjelasan dengan langkah-langkah:
semoga jelas
17. how to construct the chord of a circle with radius and length given
1. Kalau secara grafik gini caranya :
a. Bikin persamaan lingkaran dengan r = 3
contoh : x²+y² = 9 <= r² = 9
b.Pilih 2 titik yang terletak pada busur lingkaran sehingga jarak antara 2 titik x atau 2 titik y nya itu 4 meter (pilih x atau y, salah satu saja)
c. Bikin sebuah garis vertikal (kalau yang dipilih 2 titik y yang berbeda), atau sebuah garis horizontal (kalau yang dipilih 2 titik x berbeda)
cara untuk yang kedua sama, tapi r² nya itu (4,5)² dan jarak antar x atau y nya 6,7
18. The circumference of circle is 248 a. circle radius b. area of the circle
Diketahui:
The circumference of ⭕ = 248Ditanya:
➊ The circle radius? ➋ Area of the circle?Jawab:
➊ A circle radius[tex]Circumference = \pi \times diameter \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ 248 = 3,14 \times diameter \\ diameter= \frac{248}{3,14} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ diameter = 78,98 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ diameter = 79 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ radius = 79 \div 2 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ radius = \boxed{39,5} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: [/tex]
So, the circle radius is [tex] \boxed{39,5} [/tex]➋ Area of the circle[tex]= \pi \times {r}^{2} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ = 3,14 \times {39,5}^{2} \: \: \: \: \: \: \: \\ = 3,14 \times 1.560,25 \\ = 4.899,185 \: \: \: \: \: \: \: \: \: \: \: \: \: \\ = \boxed{4.899,2} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: [/tex]
So, area of the circle is [tex] \boxed{4.899,2} [/tex]☻ stay healthy ☻
19. find the circumference of a circle with radius (a).30 cm (b).100cm
Jawab:
a. 188,5 cm
b. 628,3 cm
Penjelasan dengan langkah-langkah:
Circumference = 2 × π × radius
a. 2 × π × 30 cm = 188,5 cm
b. 2 × π × 100 cm = 628,3 cm
#BACKTOSCHOOL2020
20. The radius of the circle [tex] x^{2} + y^{2} - 4x + 6y - 12 = 0 is ...
[tex] \sqrt{ \frac{A^{2}+B^{2}}{4}-C } [/tex]
[tex] \sqrt{ \frac{(-4)^{2}+(6)^{2}}{4}-12 } [/tex]
[tex] \sqrt{ \frac{52}{4}-12 }[/tex]
[tex] \sqrt{13-12} [/tex]
= 1
^_^
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