Students arrived at the science museum at 1:15 P.M. They stayed at the museum for

Mathematics

2 answers:

marshall27 [118]3 years ago

6 0

A I think sorry If wrong

Diano4ka-milaya [45]3 years ago

3 0

Answer: A. O 3:06 P.M.

Step-by-step explanation: 1:15+2 hours=3:15 3:15+51 mins=3:06

You might be interested in

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

Mr. and Mrs. Quagmire are trying to decide on a name for their new baby girl. for the first name they like either Melissa, Jenni

marin [14]

8 choices
4 first names and for each 2 middle names

6 0

2 years ago

Statistics tutor from this 2 way. frequency which statement is false ?

Tju [1.3M]

<span>statement is false:

D) 15% of her students are in biology...this is false

correct: 5</span>5% of her students are in biology

8 0

3 years ago

WILL LIST BRAINLIST

aleksandr82 [10.1K]

Answer:

I believe the answer is -176º

6 0

3 years ago

Please can I help me

melamori03 [73]

Answer:

I think it's -7.73

it's -7.73 bc u add all 3 then divide -85 by 11

7 0

2 years ago