Answer:
Explanation:
you have right triangle & isosceles
so is 45-90-45
PR^2=PQ^2+QR^2
c^2=a^2+b^2, where c is the hypotenuse, and a=b
(3)^2=2a^2
18=2a^2
9=a^2
a=3, b=3, both legs are equal to 3
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