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M3-037-A11-V02
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G-GMD.4
Warmup
M3-037-A11-V02
Identify cross-sections of 3D objects and solids generated by rotating 2D objects.
Identify a solid from a fully specified generating region and axis
Problem
The filled right triangle with vertices \((0,~0)\), \((0,~h)\), and \((r,~0)\) rotates \(360°\) about \(x~=~0\). Use the diagram to state the region, axis, resulting solid, radius, height, slant height, and volume.
Answer choices
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A
The generating region is the filled triangle, the axis is x = 0, the solid is a right circular cylinder of radius r, height h, and volume pi r² h.
B
The generating region is treated as only its boundary, the axis is x = 0, the result is a hollow conical surface of radius r, height h, slant height sqrt(r²+h²), and enclosed volume 0.
C
The generating region is the filled triangle, the axis is x = 0, the solid is a right circular cone of radius r, height h, slant height sqrt(r²+h²), and volume (1/3)pi r² h.
D
The generating region is the filled triangle, the axis is x = 0, the solid is a right circular cone of radius h, height r, slant height sqrt(r²+h²), and volume (1/3)pi h² r.
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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 Identify a solid from a fully specified generating region and axis