Question

Find the value of side a on the right triange, given that side B=12cm and side C=15cm

A. 3cm
B. 9cm
C. 25cm
D. 27cm

Answer 1

Use Pythagoras's theorem.

`a^(2) + b^(2) = c^(2)`

Now, minus 12 from 15:
15 - 12 = 3,
which you need to square.
So the length of a = 9cm.

You can also do:

`\sqrt{15^(2) - 12^(2) }`
Which gets 9.

Hope this helps.