00:01
Okay, i have here a right triangle like this with the legs 2 and 4.
00:08
And the first thing it says, find the exact value of the hypotenuse.
00:14
Let's call this one then h.
00:16
Well, we know h squared equals 2 squared plus 4 squared as pythagoras.
00:24
So h then is the square root of 4 plus 16.
00:32
Or the square root of 20.
00:35
Now that you can run a bit neater as 2 root 5.
00:41
So 2 root 5 then is the exact value of the hypotenuse.
00:46
Now on a calculator, i worked that out.
00:50
2 times the square root of 5, i get 4 .472.
01:00
So this end is also 4 .472 and so on.
01:07
And it says here an approximate value.
01:12
So let's say 4 .5 then we'll do.
01:19
Now next i want to find the angles in this triangle.
01:25
Let's go back to the basic then triangle...