# Surface area of spheres (demonstration)

### Related extras #### How to copy an angle

Let’s copy a given alpha convex angle onto ray f with starting point F. #### Plotting a perpendicular on a line from a point P that is not on the line

Both line e and point P, which is not situated on line e, are given. Let’s plot line g such that... #### Prisms

This animation demonstrates several types of prisms, from general to regular. #### Plotting a perpendicular to a line at a given point P on the line

Both line e and point P, which is situated on it, are given. Let’s plot line g to include point... #### Plotting a parallel line at a given distance

Line e is given. Let’s plot a line parallel to line e 2 cm away. #### Reflecting a circle across an axis

Axis t and a circle with center O and radius r are given on a particular plane. Let’s plot the... #### Cube of cubes

An exercise about the regular hexahedron built from unit cubes to help deepen your... #### Conic solids

This animation demonstrates various types of cones and pyramids.

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