Use Pythagoras's theorem.
Now, minus 12 from 15:
15 - 12 = 3,
which you need to square.
So the length of a = 9cm.
You can also do:
Which gets 9.
Hope this helps.
Now, minus 12 from 15:
15 - 12 = 3,
which you need to square.
So the length of a = 9cm.
You can also do:
Which gets 9.
Hope this helps.