Download Parallelogram Properties

Parallelogram Properties
Study Sheet
Use ruler
1. Using the centimeter scale measure the perimeter of
the parallelogram to the tenth of a centimetre.
The perimeter of the parallelogram is ____ centimeters.
2. A designer needs a parallelogram exactly 12 times
the size of the one you measured. What will be the
perimeter of her new parallelogram?
The perimeter of her parallelogram is ____ centimeters.
3. Which of these statements about parallelograms is
not true?
A the area of a parallelogram is equal to base  height
B a parallelogram has two sets of parallel sides
C the perimeter of a parallelogram is equal to twice
the length of both the base and the height
D a parallelogram is a quadrilateral
4. Would the angles of the designer’s new parallelogram
be larger, smaller, or the same size as the angles of
the one illustrated above? Explain your answer.
Parallelogram Properties
Study Help
Some notes on measurement and geometry.
Quadrilaterals, such as parallelograms, are 4-sided
polygons.
Unlike the formula for area of a rectangle which is A = l × w,
where l and w are lengths of sides, the formula for area of a
parallelogram is A = b × h (base time height. Height is not
the measurement of a side)
w
h
l
b
The two parallelograms referred to in the questions are
similar. That means they have exactly the same shape but
their dimensions are different. For shapes to be similar their
angles must be equal. If the angles changed, the shape
would change.
Shapes that are exactly the same are called congruent.
The rhombus is a special
parallelogram. It has 4
equal sides.
The millimetre/centimetre scale
When measuring in centimetres and millimetres, it is
convenient to use decimals. This is because the centimetre
is divided into tenths. Ten millimetres make 1 centimetre.
So, 35 mm can be written as 3.5 cm, 2.8 cm is 28 mm, and
so on.
The inch scale
The inch scale is cut into half, then half again, then half
again. We use fractions when measuring inches. Your
cardboard ruler shows eighths.