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9 grade maths

An ice cream cone full of ice cream has a radius of 5 cm and a height of 10 cm. Calculate the volume of the ice cream (to the nearest integer, in cm³), provided that its 1/6th part is left unfilled with ice cream. Insert the answer as the nearest integer.






Profile image of Aniket Singh
1 Year agoGrade
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1 Answer

Profile image of Askiitians Tutor Team
1 Year ago

To calculate the volume of ice cream in the cone, we first need to calculate the full volume of the cone and then account for the fact that \(\dfrac{1}{6}\) of it is unfilled.

### Step 1: Volume of the cone
The formula for the volume \(V\) of a cone is given by:

\[
V = \dfrac{1}{3} \pi r^2 h
\]

Where:
- \(r\) is the radius of the base of the cone = 5 cm
- \(h\) is the height of the cone = 10 cm
- \(\pi\) is approximately 3.1416

Substitute the values into the formula:

\[
V = \dfrac{1}{3} \times 3.1416 \times 5^2 \times 10
\]
\[
V = \dfrac{1}{3} \times 3.1416 \times 25 \times 10
\]
\[
V = \dfrac{1}{3} \times 3.1416 \times 250
\]
\[
V = \dfrac{1}{3} \times 785.4
\]
\[
V = 261.8 \, \text{cm}^3
\]

### Step 2: Volume of the ice cream
Since \(\dfrac{1}{6}\) of the cone is unfilled, the ice cream fills \(\dfrac{5}{6}\) of the cone's volume.

\[
\text{Volume of ice cream} = \dfrac{5}{6} \times 261.8
\]
\[
\text{Volume of ice cream} = 218.17 \, \text{cm}^3
\]

Rounding to the nearest integer:

\[
\text{Volume of ice cream} \approx 218 \, \text{cm}^3
\]

Thus, the volume of the ice cream is approximately **218 cm³**.