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2 years ago

12

Two cones have a radius of 2 cm. The height of one cone is 8 cm. The other cone is 1/4 of that height. Which of these statements

is NOT true?

2 answers:

marta [7]2 years ago

8 0

The wrong statement: The volume or the smaller cone cannot be determined because its height is unknown.

We already know that the larger cone has a height of 8 cm and that the smaller cone is just 1/4 of 8 cm.

8×1/4 = 2 cm.

You can still find its volume by using the formula 1/3πr^2.

dlinn [17]2 years ago

6 0

Answer:

Out of given option only option (d) is wrong.

The volume of the smaller cone cannot be determined because its height is unknown.

Step-by-step explanation:

Given two cones with radius 2 cm.

The height of one cone is 8 cm an the height of other cone is $\frac{1}{4}$ of the height of first cone.

Height of second cone = $\frac{1}{4}$ of the height of first cone.

= $\frac{1}{4}\times 8=2$

Volume of cone = $\frac{1}{3} \pi r^2h$

Thus, Volume of smaller cone = $\frac{1}{3} \pi (2)^2 \cdot\frac{1}{4}\times 8$

= $\frac{1}{3} \pi (2)^2 \cdot 2$

= $\frac{1}{3} 4 \pi\cdot 2$

Thus, out of given option only option (d) is wrong.

The volume of the smaller cone cannot be determined because its height is unknown.

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solniwko [45]

Answer:

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Step-by-step explanation:

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2 years ago

A simple impact crater on the moon has a diameter of 15 kilometers. a complex impact crater has a radius of 30 kilometers. how m

timurjin [86]

The general equation for computing the circumference of a circle is $C=\pi d$ , where C is the circumference, and d is the diameter. (You might also see the equation as $C=2 \pi r$ where r is the radius, because $d=2r$ )

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$C_{d=15}=\pi (15)=15\pi$
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To calculate the ratio of two numbers, we can divide one by the other. You can look at this as "How many times does the denominator fit in the numerator?"
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3 years ago

A boat in still water is 32 mph. If the boat travels 72 miles upstream in the same time that it takes to travel 120 miles downst

dalvyx [7]

Dup= 72 miles
<span>ddown= 120 miles </span>
<span>v= riverspeed </span>
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<span>t both ways= t </span>

<span>d=r*t </span>
<span>d/r=t </span>

<span>t=ddown/rdown </span>
<span>t=dup/rup </span>

<span>dup/rup = ddown/rdown </span>

<span>(72)/(32-v)=(120)/(32+v) </span>
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2 years ago

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Alina [70]

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2 years ago

Read 2 more answers

12 POINTS! HELP ASAP!!

Aleks [24]

Answer:

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Step-by-step explanation:

When a point (x,y) is reflected across the y-axis, you need to change the sign of x. For example, if (-x,y) you need to take away the negative sign, which makes (x,y). Or, if the point is (x,y), you need to add a negative sign to the x, which makes (-x,y). So, if your point (-2, -4) is reflected across the y-axis, you need to take the negative sign off the -2, which makes (2,-4).

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2 years ago