### Video Transcript

Here is a sketch of a triangle. It is not drawn to scale. Draw the full-size triangle
accurately below. Use an angle measurer — sometimes
called a protractor — and a ruler. One line has been drawn for
you.

Now, in the diagram, we can see
that the baseline needs to be eight centimeters long. This angle is a right angle. It’s 90 degrees. And this angle needs to be 35
degrees. Now, they’ve given us a start
because this line here is eight centimeters long. When you print this question out to
do on a piece of paper, make sure you measure the length of that line and make sure
that it is eight centimeters. If you don’t print this at 100
percent scale, then you’ll find that your answer will look slightly different to our
answer.

Now, I would recommend drawing a
little notch like this at each end of the line. That’s gonna make it easier for us
to use our protractor. First, let’s look at how we can use
our protractor to create an angle of 35 degrees here. This black line going between zero
degrees and zero degrees on your tractor is called the baseline of the
protractor. And this vertical line going up to
90 degrees here makes a little crosshair target.

Place the protractor down very
carefully so that the baseline of the protractor lines up perfectly with the
eight-centimeter baseline we were given in the question. Also, make sure that the crosshair
that we talked about lines up perfectly with that little notch that we drew at the
left-hand end of the line. With those two things very
carefully lined up, you’ll notice that we’ve got two sets of numbers on our
scale.

We can either start counting from
zero degrees upwards in this direction on the outer scale or zero degrees upwards in
this direction on the inner scale. If we look back at our sketch, this
is the sort of angle we want to make at the left-hand end. So on our protractor, we’re gonna
start at zero from here and count up 35 degrees in this direction. If we go up to 30, we get to
here. And then, we notice that this bit
of the scale has got 10 little markings. Each one of those is one
degree. So 35 degrees is this mark
here. Carefully mark that off with your
pencil.

It’s a good idea to look directly
down onto the piece of paper above the angle when you’re marking it and to have a
nice, sharp pencil to get this as accurate as you can. For the next bit, we’re going to
put our pencil at this point here on this end of the line. And we’re going to draw a line that
goes up through this mark here. Because the angle on the right is
90 degrees, it’s helpful to imagine a dotted line going straight up from that
point. And when we draw our line, we need
to make sure that it’s gonna extend far enough so that it goes beyond that imaginary
dotted line.

So take your protractor away. Put your pencil point here. Bring the ruler up so that it
touches that point. And then swivel it round so that it
lines up with the mark that you’ve made earlier at 35 degrees. Now, you can join the two up and
extend the line off as we said. The result should look something
like this. Now, we’re going to need to bring
our protractor back and line the crosshair up with the other end of the line so that
we can measure our angle of 90 degrees.

Again, take care to make sure that
the baseline of the protractor lines up perfectly with the baseline that we were
given in the question and that the crosshair on your protractor lines up perfectly
with the right-hand end of the line and the little notch that you made on it. Again, looking back at the sketch,
we can see that this time we want to draw our angle in this direction. So we’re going to start with this
zero on the scale and work our way up on the outer set of numbers until we reach
90. Then, we can carefully mark off at
90 degrees a little notch on the paper.

Again, use a sharp pencil and look
directly down onto your protractor to make this as accurate as you possibly can. Next, we’re going to take the
protractor away and join this end of the line here to draw a line through this notch
we just created up here. Place your pencil firmly here on
the paper. Slide the ruler up until it touches
it. And then, swivel it round until
it’s in line with the notch that you made. Carefully checking that those two
things are still lined up, we can now draw in this line.

When you’re finished, your triangle
should look something like this. It’s worth checking with your
protractor that this angle is definitely 35 degrees and this angle is 90
degrees. If you’ve drawn everything
accurately, then this side here should be about 5.6 centimeters and this side here
should be about 9.8 centimeters. And this is what our final answer
should look like. And remember the question didn’t
ask you to check the 9.8- or the 5.6-centimeter dimensions. We’ve just included those to help
you check whether you got your answer right.