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3 years ago

Please help me plzzzzzzzzzzzzz

Mathematics

1 answer:

Stels [109]3 years ago

4 0

Which question is it? 20?

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No work just an answer

Paladinen [302]

Answer:

437.4m

Step-by-step explanation:

1 cm = 4.5m

7.2x4.5=32.4

3x4.5=13.5

32.4x13.5 = 437.4m

3 0

3 years ago

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 the price called at which the quantity demanded is equal to the quantity supplied?

sladkih [1.3K]

Equilibrium Price
Hope This Helps

8 0

4 years ago

Read 2 more answers

If 5 x 6 = 20+y. what is the value of y? Select one: 10, 6 ,5 ,30

AlladinOne [14]

Answer:\

y=10

Step-by-step explanation:

5 times 6 to 30

30=20+y

Subtract 20 from both sides.

30-20=y

Simplify 30-2o to 10.

10=y

y=10

4 0

3 years ago

What is the domain of the function graphed below?

Leokris [45]

Answer:

A. x<7

Step-by-step explanation:

The point at x=7 is an open circle, so the sign is <, not ≤

6 0

3 years ago