Angles Flashcards
What angle is this:
————c-/———-
/
/
———–/c———–
Alternate angle
What angle is this:
/c --------------/------------
/
/ --------/c----------------
Corresponding angle
Angles around a point sum to…
360 degrees
What angle is this:
—————-/c——–
/
/
/
———/–c————–
Co-interior angle
Angles on a straight line sum to…
180 degrees
Vertically opposite angles are…
Equal
Alternate angles are…
Equal
Corresponding angles are…
Equal
Co-interior angles sum to…
180 degrees
Opposite angles of a parallelogram are…
Equal
Angles in a triangle sum to…
180 degrees
Base angles of an isosceles triangle are…
Equal
The exterior angle of a triangle equals the sum of…
The two opposite interior angles
What is the formula to calculate the sum of the interior angles of an n sided polygon?
180(n-2)
What is the formula to calculate an interior angle of an n sided polygon?
180(n-2) divided by n
The sum of the exterior angles of a shape sum to…
360 degrees
How would you calculate an exterior angle of an n sided shape?
360/n
How would you calculate an interior angle in a shape?
180 - Exterior Angle
What is a regular polygon?
A shape that consists of straight sides that all join at a vertex and have at least three sides.
What are the main three shapes that tesselate?
Triangle, square and hexagon
For a shape to tesselate, it must…
Have interior angles that are a factor of 360 e.g. triangle= 60. 60x6=360
How would you calculate how many sides a regular polygon has based on its exterior angle?
Its exterior angle (one) must be divisible by 360
e.g. exterior of hexagon = 60
360/60= 6
