Hemisphere is a 3D shape formed by cutting a sphere into two equal halves. Has one flat base and one curved surface. Flat side is called base or face
A right circular cone has an axis perpendicular to its base plane. It is formed by rotating a right triangle about one leg. Contains one circular base, one apex, and no edges
3D shapes occupy space and have three dimensions. Volume is the space enclosed by a 3D object. SI unit of volume is cubic meters
Cone is a three-dimensional figure with circular base and pointed apex. Contains vertex, base, and axis. Base is circular and largest cross-section. Vertex is point directly above base center
Hemisphere is a three-dimensional figure that is exactly half of a sphere. Earth is made up of two hemispheres: Northern and Southern. There are two types: solid and hollow hemispheres
Cycloid is a curve traced by a point on a circle rolling on a line. Area under one arch is 3πr, 3 times the area of the circle. Arc length of one arch is 8r, 8 times the radius of the circle. Volume of one arch about x-axis is 5π²r³