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M3-037-A07-V02
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G-GMD.4
Warmup
M3-037-A07-V02
Identify cross-sections of 3D objects and solids generated by rotating 2D objects.
Determine cone dimensions from a rotated right-triangle region
Problem
A filled right triangle with legs \(a\) and \(b\) is rotated separately about leg \(a\) and about leg \(b\). Use the diagrams to identify \(\text{both}~\text{solids}\), their radii and heights, their slant heights, and whether their volumes must match.
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A
The results are two cones: about a, radius b and height a; about b, radius a and height b. Both have slant height sqrt(a²+b²), and their volumes are always equal.
B
The results are two cones: about a, radius b and height a; about b, radius a and height b. Both have slant height sqrt(a²+b²), and their volumes need not match.
C
The results are two cylinders: about a, radius b and height a; about b, radius a and height b. Their volumes are pi b² a and pi a² b, respectively.
D
The results are two cones: about a, radius a and height b; about b, radius b and height a. Both have slant height sqrt(a²+b²), and their volumes need not match.
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Curriculum context
Standard G-GMD.4
Category Geometry
Domain Geometric Measurement and Dimension
Objective Identify cross-sections of 3D objects and solids generated by rotating 2D objects.
Problem type Determine cone dimensions from a rotated right-triangle region