Video Transcript
The table below shows some
information about a scale drawing. Complete the missing details,
including whether the drawing is a magnification or reduction from real life.
And what we’re gonna do first of
all is take a look at the scale. And what the scale tells us is that
it’s 22 to one. And what we can see is that the 22
refers to the drawing distance, so it’s 22 parts, and the one refers to the real
distance. So therefore, what we can see is
that the drawing distance is in fact going to be bigger than the real distance. So therefore, we can surmise that
this is actually going to be a reduction. However, what we can do is check
this out by putting in our values.
So what we know is that the drawing
distance is 66 centimeters. And we need to see how we get from
22 to 66. Well, what we do is we multiply by
three. And if we multiply one by three,
we’re gonna get three. So we know that the drawing
distance is 66 centimeters. And therefore, the real distance is
gonna be three centimeters. However, this is not quite the
answer we want because if we check the table, the table says the real distance in
millimeters.
So we need to remind ourselves of
one of our conversion factors. And that is that one centimeter is
equal to 10 millimeters. So therefore, the real distance is
gonna be 30 millimeters because it’s three multiplied by 10, which gives is 30. And we know and can confirm that in
fact it’s going to be a reduction from real life because we can see that the
real-life distance is in fact smaller than the drawing distance.
