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3 years ago

Take a point O on your notebook and draw circles of 3.6 cm, 4.5 cm and 5.3 cm , each having the same centre O.

Mathematics

2 answers:

gavmur [86]3 years ago

3 0

Answer:

to aage kya keru koi Q hai to bol

tino4ka555 [31]3 years ago

3 0

Answer:

I hope it help pls mark me brainlest pls

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1)a chord of length 18cm midway the radius of a circle. calculate the radius of the circle correct to 1d.p. 2)if two parallel ch

kykrilka [37]

Part 1:

Given that the length of the chord is 18 cm and the chord is midway the radius of the circle.

Thus, half the angle formed by the chord at the centre of the circle is given by:

$\cos\theta=\frac{\left( \frac{1}{2} r\right)}{r}= \frac{1}{2} \\ \\ \Rightarrow\theta=\cos^{-1}\left( \frac{1}{2} \right)=60^o$

Now,

$\sin60^o= \frac{9}{r} \\ \\ \Rightarrow r= \frac{9}{\sin60^o} =10.392$

Therefore, the radius of the circle is 10.4 cm to 1 d.p.

Part 2I:

Given that the radius of the circle is 10 cm and the length of chord AB is 8 cm. Thus, half the length of the chord is 4cm. Let the distance of the mid-point O to /AB/ be x and half the angle formed by the chord at the centre of the circle be θ, then

$\sin\theta= \frac{4}{10} = \frac{2}{5} \\ \\ \theta=\sin^{-1}\left( \frac{2}{5} \right)=23.6^o$

Now,

$\cos23.6^o= \frac{x}{10} \\ \\ \Rightarrow x=10\cos23.6^o=9.165\approx9.2cm$

Part 2II:

Given that the radius of the circle is 10cm and the angle distended is 80 degrees. Let half the length of chord CD be y, then:

$\sin40^o= \frac{y}{10} \\ \\ \\ \Rightarrow y=10\sin40^o=6.428$

Thus, the length of chord CD = 2(6.428) = 12.856 which is approximately 12.9 cm.

3 0

3 years ago

What is 0.8637 rounded to the nearest hundredth?

Wittaler [7]

Answer:

0.87

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers

Please can I have some help thank you :)

Evgen [1.6K]

9514 1404 393

Answer:

£592 for 16 boxes

Step-by-step explanation:

The classroom floor area is ...

A = LW = (8.8 m)(2.2 m) = 19.36 m²

The cupboard floor area is ...

A = (2.3 m)(2.1 m) = 4.83 m²

Then the total area to be covered is ...

19.36 m² +4.83 m² = 24.19 m²

At 1.6 m² per box, the number of boxes required is ...

(24.19 m²)/(1.6 m²/box) = 15.12 boxes

If we assume we can only purchase whole boxes, we need to purchase 16 boxes to cover the floor. The cost will be ...

(16 boxes)(£37/box) = £592 . . . . cost of laminate to replace the floor

8 0

3 years ago

A rectangle table is two times as long as it is wide. If the area is 50ft^2. Find the length and width of the table.

marta [7]

Answer:

W = 5 ft; L = 10 ft

Step-by-step explanation:

Start by representing the length and width:

W = W

L = 2W

Area of rectangle = L * W = 2W * W = 50 ft^2. Then 2W^2 = 50 ft^2.

Solving for the width W results in W^2 = 25 ft, or W = 5 ft.

The length, L, is therefore L = 2W = 10 ft.

Check: Does L * W = 50 ft^2? Does (5 ft)(10 ft) = 50 ft^2? YES

5 0

3 years ago

Write an equation of the line that passes through (-4,-1) and is perpendicular to the line y=4/3x+6

pochemuha

Y = -3/4x - 2 is the answer

4 0

3 years ago

Take a point O on your notebook and draw circles of 3.6 cm, 4.5 cm and 5.3 cm , each having the same centre O.​

Take a point O on your notebook and draw circles of 3.6 cm, 4.5 cm and 5.3 cm , each having the same centre O.