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Mathematics - Unit 1
Symmetry and Surface Area
9
Mathematics
9th Grade
12/19/2017

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Cards

Term
What is line symmetry
Definition
When a shape can be divided into identical parts by a line of symmetry / reflection
Term
How many lines of symmetry do these shapes have [image]
Definition
[image]
Term
What is rotational symmetry?
Definition
When a shape or design can be turned about its centre of rotation so that it fits onto its outline more than once in a complete turn
Term
What is the angle of rotation
Definition
The minimum angle in which the shape will turn into itself (360 degrees divided by the order of rotation)
Term
What is the order of rotation
Definition
the number of times a shape or design ts onto itself in one complete turn
Term
what are 3 types of symmetry?
Definition
horizontal, vertical, oblique (diagonal)
Term
how to find surface area
Definition
area of each face
Term
formulas to use for different shapes
Definition
2bh+2wh+2bw=surface area of rectangular prism
2 • pi • r • r + d • pi • h + surface area of a cylinder (sorry the formatting wasnt working)
Term
3 methods to calculating surface area
Definition
Each face - calculate the surface area of each face and add
Symmetry - caculate surface area of the front, back, top, bottom, and both sides and add
Overlap calculate surface area of all cubes the subtract number of faces touching (only works wuth cubes)
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