Today we learned about Enlargements and reductions.
Enlargement is to make something bigger. In mathematics we need to multiply by a factor greater than 1 to make it an enlargement. (eg. 3x2)
Reduction is to make something smaller. In mathematics we need to multiply by a factor that
is less than 1 but greater than 0 (eg. 7x0.2)
Scale Factor- the constant factor by which all dimensions of an object are to be inlarged or reduced. some examples of this is:
If a rectangle that is 3x5 is to be enlarged by a scale factor of 1.3 the new dimensions would be
3.9x6.5. If that same rectangle was to be Reduced by a scale factor of 0.6 the new dimensions would be 1.8x3
To make Enlargements and Reductions it must be proportional, maintaining its original shape, but not size.
Enlargements and Reductions can also be made on different sized graph paper. This method is often used by artistswhen drawing large murals from a small original, vice versa.
Homework:
Workbook 4.1
text 1,3
practise odd/even
apply 9,11,12,13
extend 14, 15, 17
extra practice worksheet
No comments:
Post a Comment