Sydney Opera House
acute angles:
smaller than 90

degrees angle.
intersecting line- Lines that cross each other.
isosceles triangles:
triangles that have 

two sides that are 

the same size.
obtuse angles:angle
that is bigger than 90 
degree angle.
parallel lines:lines that
never cross other
right angle: an angle that
is 90 degrees.
vertex: a corner point
ray: point at one end and keeps 
scalene triangle: none of the sides are the same. 
equilateral:sides of a triangle that are all
the same
 The Sydney Opera House holds a special place in modern architecture. The Sydney Opera House is not just another famous structure, but a building that is a masterpiece of geometry, technology and architectural design. It was built as a "signature building" and a symbol of the city. Functional and powerful geometric forms combine to shape this building into one of the most famous pieces of architecture in the world.

The geometry of the shells define the Sydney Opera House. The shells were all taken from the same sphere. Each shell was made up of series of ribs formed by parallel lines. The shells intersect to create a look of sails. Engineers could not calculate the precise geometry for the shell until the forces and bending moments were known. These could not be calculated until the exact geometric form was established. Engineers work on computers for almost a year to develop the form of the shells. The Sydney Opera House was one of the first buildings in the world to use computers in its design process. 

Within the shells you can what appear to be acute angles and obtuse angles. Although formed from a sphere the shells seem to have the shape of an isosceles triangle. There are panels in the building made up of ceramic tiles. These tiles form tessellations that make repeated diamond patterns. The shells and the panels are supported by a huge rectangular base. 

By Zalia and Sandra