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Expert: - 12/4/2007


Question
I just ask a question on an right isosceles triangle and i mistaken the right side it should be a r - not s
sorry

Answer
Hi, Sue,

I didn' see that (isosceles) before. Now it's easy. (But PLEASE learn how to use the vocabulary.  All you had to do is to say:

RST is a right isosceles triangle with <T=90, ST = 7.
Find r and <R.

(Yes, that's the whole thing.)

Now you say:
1. If it's isosceles, then <R = <S and since <R + <S = 90, <R = 45 degrees.
2.If it's isosceles, then s = r and

s^2 + s^2 = 7^2
2s^2  = 7^2

s^2 = 7^2/2, s = 7/sqrt(2)  

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