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Volume of Cones Riddle Activity | Radius and Diameter Practice

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Practice finding the volume of cones with this Volume of Cones Riddle Activity. Students solve cone volume problems using a mix of radius and diameter values, then use their answers to complete the riddle.


This activity includes 12 volume of cone problems. Students will practice identifying the needed measurements, using the cone volume formula, and paying close attention to whether they are given the radius or diameter.


The riddle format gives students a built-in way to check their work. If answers are incorrect, the riddle will not work correctly, helping students catch mistakes as they solve.


What’s Included:

• 12 volume of cone problems

• Practice with radius

• Practice with diameter

• Student worksheet

• Riddle answer format

• Completed teacher answer keys

• Print-ready student pages


Perfect for:

• Volume of cones

• Cone volume practice

• Radius and diameter review

• 8th grade geometry

• CCSS 8.G.C.9

• Math centers

• Independent practice

• Homework

• Sub plans


Working with both radius and diameter helps students identify the correct measurement before substituting values into the cone volume formula.


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Terms of Use

This resource is for one teacher only. Additional teachers will need to purchase their own license. You may use this resource with your own students in your classroom or password-protected learning platform.


Please do not share, post, copy, sell, or upload this resource anywhere that others can access it.


If you need additional licenses or have questions, please contact me at learningmaderadical@gmail.com.


© 2026 Kara Holland. All rights reserved.

You will get a PDF (4MB) file