Answer:
[tex]r=43.3\ cm[/tex]
Step-by-step explanation:
we know that
Applying the Pythagorean Theorem in the right triangle drawn with dashed lines
[tex]c^2=r^2+h^2[/tex]
where
c is the hypotenuse (the greater side) r and h are the legs (perpendicular sides)
we have
[tex]c=3(15)=45\ cm\\h=12.2\ cm[/tex]
substitute
[tex]45^2=r^2+12.2^2[/tex]
[tex]r^2=45^2-12.2^2[/tex]
[tex]r^2=1,876.16\\r=43.3\ cm[/tex]
