^assuming that is correct^
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Does anybody have any ideas on how to work out [imath]\sqrt{0.9}[/imath] without a calculator (to approx 10 d.p.)?
I know there are a few methods for working out for working out square roots by hand, but i was wondering if there was a cleverer/easier way of doing it.
- that's true. I originally saw this proof for 'teletubbies', for which it worked, because they were the PRODUCT of time and money (hence multiplication)...
i was wondering if somebody had any ideas about this:
the gradient of a horizontal line = 0
the gradient of a vertical line = infinity
but the product of the gradients of perpendicular lines is -1
so does that mean that 0 x infinity = -1 ???
... or is there something in the proof for the product of the gradients equalling -1 which excludes it for these values?
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