Shape 1 Facts Flashcards
How many degrees are in a full turn?
360
How many degrees in a right angle?
90
What do we call an angle between 0 and 90 degrees?
An acute angle
What’s a reflex angle?
An angle between 180 and 360 degrees.
What’s an obtuse angle?
An angle between 90 and 180 degrees
What do we call a triangle where all three sides have the same length?
Equilateral
What do we call a triangle with exactly two equal sides and equal base angles?
Isosceles
What do we call a triangle with three different lengths of sides?
Scalene
How many equal length sides does an isosceles triangle have?
2
Name a difference between an equilateral and isosceles triangle.
An isosceles triangle has 2 equal length sides, an equilateral triangle has 3 equal length sides.
Describe the angle properties of a parallelogram.
Opposite angles are equal. Consecutive angles sum to 180 degrees.
Describe the properties of the diagonals of a square
The diagonals are perpendicular to and bisect each other.
What are the properties of the diagonals of a kite ?
The diagonals cross at right angles cross at right angles and one bisects the other.
What do we call a quadrilateral with four equal length sides, no right angles and two pairs of parallel sides?
Rhombus
What do we call the quadrilateral with two pairs of equal side lengths that are adjacent to each other?
Kite
What kind of angle is at the corner of a rectangle?
A right angle
How many pairs of parallel sides does a trapezium have?
1
How many pairs of parallel sides does a rhombus have?
2
How many pairs of parallel sides does a parallelogram have?
2
How many pairs of parallel sides does a rectangle have?
2
How many sides does a decagon have?
10
What do we call a polygon with eight sides?
Octagon
What do we call a four sided shape?
Quadrilateral
What do we call a polygon with five sides?
A pentagon
What’s a hexagon?
A six sided shape
How many sides does a dodecagon have?
12
Why is a circle not a polygon?
It’s edge is curved
How many faces does a cube have?
6
How many vertices does a cube have?
8
How many edges does a cube have?
12
How many faces does a triangular prism have?
5
How many faces does a cuboid have?
6
What shape is the cross section of a cylinder?
A circle
How many vertices does a square based pyramid have?
5
What do adjacent angles on a straight line add to?
180 degrees
What do we call angles across each other on an “x”shape?
Vertically opposite angles
What do we call angles on parallel lines that are inside a “Z shape”
Alternate angles
What do we call equal angles on parallel lines that “slide down an F shape”?
Corresponding angles
What do we do on lines to show they are parallel?
Arrowheads
What do we call two angles “inside” two parallel lines that sum to make 180 degrees?
Co-interior
What’s the order of rotational symmetry of a square?
4
What’s the order of rotational symmetry of a rectangle?
2
What’s the order of rotational symmetry of a regular pentagon?
5
What’s the order of rotational symmetry of an equilateral triangle?
3
What’s the order of rotational symmetry of a letter “p”?
No rotational symmetry
How many lines of symmetry does a square have?
4
How many lines of symmetry does a rectangle have?
2
How many lines of symmetry does a kite have?
1
What’s the formula for the sum of the interior angles of an n-sided polygon?
180(n-2)
What’s the size of each angle in an equilateral triangle?
60 degrees
What’s the sum of the exterior angles of a polygon?
360 degrees
What’s the sum of the exterior and interior angle of any polygon?
180 degrees
What’s the sum of the interior angles in a quadrilateral?
360 degrees
What’s the sum of the interior angles in a triangle?
180 degrees
What’s the sum of the interior angles in a pentagon?
540 degrees
What’s the sum of the interior angles in a hexagon?
720 degrees
What are the four tests for triangle congruency? Give the initials.
SSS, SAS, ASA (or AAS), RHS
What do we call two triangles with equal corresponding angles and proportionate sides?
Similar triangles
What does congruent mean?
Identical
If two triangles have the same three angles, why might they not be congruent?
They could have different side lengths
In the triangle congruency condition RHS, what do R, H and S stand for?
Right angle, hypotenuse and side.
