Two concentric circles with different radii share how many common tangent lines?

1 answer:

7 0

The answer is a.0

Concentric means these circles would have the same center, thus, the smaller circle must be inside the bigger circle. Any tangent line to the smaller circle wont be a tangent line to the bigger circle, since that tangent line would intersect at the bigger circle at 2 points. Any tangent line to the big circle will not touch the small circle... so the answer would be 0.

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What is the next number in the sequence? 2,53, 643

pshichka [43]

Answer:

10,33

Step-by-step explanation:

2,53 to 6,43

when you go up 4 on the first number, you go down 10 on the second number

7 0

2 years ago

1.How many minutes would you have to exercise each day to have a resting heart rate of 60 beats per minute? Need a Hint? 20 minu

Inessa05 [86]

20 minutes, I believe. I’m not sure please don’t take may word for it. I would most likely need more information.

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4 years ago

I don’t understand 13 or 14 can someone help me

saw5 [17]

Use cosine law, which says that c² = a²+b²-2ab cosC.
in the cosine law formula, angle C is the angle opposite to side c. so a and b should be opposite to angles that you do NOT know. that is when you can know to use the cosine law

here, a = 12 yd, b = 17yd, and C = 53°. so we can find QS using cosine law. if c = QS then

c² = 12²+17²-2(12)(17) cos53
c = √[ 12²+17²-2(12)(17) cos53 ]
c = 13.69158 yd = QS

them you can use sine law to find the angles

for angle S

sin S / 12 = sin 53 / 13.69158

sin S = 12 sin 53 / 13.69158
S = sin⁻¹(12 sin 53 / 13.69158)
S = 44.42417°

for angle Q

sin Q / 17 = sin 53 / 13.69158
Q = sin⁻¹(17 sin 53 / 13.69158)
Q = 82.5758

your answers to nearest tenth:
m∠Q = 82.6°
m∠S = 44.4°
QS = 13.7 yd

for question 14, we establish that the angle of depression is in that spot there that forms with the dashed lines. then we can say that angle is the same as that angle in the triangle that forms with the ladder. then, since that's a right angle, we use cosine to find the length between the bottom of ladder to the wall

cos 62 = d / 24
d = 24*cos62
d =11.3 ft