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Khan Academy
Learn about shapes! Discover how to count faces and edges on 3D figures. We explore a transparent shape with five faces and another shape, a square pyramid, with eight edges and five faces.
Cross sections of 3D objects (basic) (practice) | Khan Academy
Match 3D objects with their 2D cross-sections. If you're seeing this message, it means we're having trouble loading external resources on our website. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.
Khan Academy
If you're seeing this message, it means we're having trouble loading external resources on our website. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.
Khan Academy
Math: Get ready courses; Get ready for 3rd grade; Get ready for 4th grade; Get ready for 5th grade; Get ready for 6th grade; Get ready for 7th grade; Get ready for 8th grade
Dilating in 3D (video) | Solid geometry | Khan Academy
The cross sections of 3D shapes are dilations of the original shape, centered at a specific point. The scale factor of the dilation depends on the height of the cross-section or the distance from the point on the base.
Unit 6: Volume - Khan Academy
Volume and surface area help us measure the size of 3D objects. We’ll start with the volume and surface area of rectangular prisms. From there, we’ll tackle trickier objects, such as cones and spheres.
Unit 9: 3D figures - Khan Academy
Unit 9: 3D figures. Our mission is to provide a free, world-class education to anyone, anywhere. Khan Academy is a 501 (c) (3) nonprofit organization. Donate or volunteer today!
Geometry - Khan Academy
Geometry - Khan Academy
Khan Academy
Course: Multivariable calculus > Unit 4. Lesson 9: Polar, spherical, and cylindrical coordinates. Double integrals in polar. Triple integrals in cylindrical coordinates.