That's it. We are at home; we can't go outside (I live in Italy) unless we have to buy groceries or medicines. School are being closed since the beginning of March, and we don't know when and if will open again. I'm locked at my place and I'm scared, I have to admit. I'm afraid … Continue reading Online teaching

# Category: geometry

# Sphere

A sphere is the set of all points, in three-dimensional space, which are equidistant from a point. The radius has one endpoint on the sphere and the other endpoint at the center of that sphere. The diameter of a sphere must contain the center and touch two points of the sphere. The largest circular cross-section in a sphere is a great … Continue reading Sphere

# Cone

A cone is a solid with a circular base and sides that taper up towards a vertex. A cone is generated from rotating a right triangle, around one leg. A cone has a slant height. Surface area Surface area is a two-dimensional measurement that is the total area of all surfaces that bound a solid. The basic unit of … Continue reading Cone

# Cylinder

A cylinder is a three-dimensional shape with a pair of parallel and congruent circular ends, called bases. Cylinders can be right or oblique. The side of a right cylinder is perpendicular to its circular bases. A cylinder has a single curved side that forms a rectangle when laid out flat. Surface area of a cylinder The area of … Continue reading Cylinder

# Pyramid

A pyramid is a three dimensional shape made up of a base and triangular faces that meet up at the vertex, V, which is also called the apex of the pyramid. Surface area of a pyramid The surface area is composed by two parts: the area of the base and the lateral area. Area … Continue reading Pyramid

# Prism

A prism is a solid figure that has two parallel congruent sides that are called bases that are connected by the lateral faces that are parallelograms. There are both rectangular and triangular prisms. Surface area of a Prism If we want to find the total surface of a prism we need to add twice … Continue reading Prism

# Cuboid

Cuboid A rectangular solid is also called a rectangular prism or cuboid. In a rectangular solid, the lenght, width and height might be of different lenghts Volume The volume is found using the formula: Inverse formulas: Surface area The total surface area (TSA) of a cuboid is the sum of the areas of its six … Continua a leggere Cuboid