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15) The base area of a cone is 49 cm² and the height is 3 cm. Find its volume.

a) 147 cm³
b) 98 cm³
c) 49 cm³
d) 154 mm³


Sagot :

To find the volume of a cone, we use the formula for the volume of a cone, which is:

[tex]\[ V = \frac{1}{3} \times \text{base area} \times \text{height} \][/tex]

Given:
- The base area of the cone ([tex]\( A \)[/tex]) is [tex]\( 49 \, \text{cm}^2 \)[/tex].
- The height of the cone ([tex]\( h \)[/tex]) is [tex]\( 3 \, \text{cm} \)[/tex].

Now, we substitute the given values into the formula:

[tex]\[ V = \frac{1}{3} \times 49 \, \text{cm}^2 \times 3 \, \text{cm} \][/tex]

First, multiply the base area by the height:

[tex]\[ 49 \times 3 = 147 \][/tex]

Next, multiply the result by [tex]\(\frac{1}{3}\)[/tex]:

[tex]\[ \frac{1}{3} \times 147 = 49 \][/tex]

Thus, the volume of the cone is:

[tex]\[ 49 \, \text{cm}^3 \][/tex]

Therefore, the correct answer is:

c) [tex]\( 49 \, \text{cm}^3 \)[/tex]