The diagram below shows a tunnel.
Given that the radius
of the tunnel is 5 m
and the distance
from the center, O to
the straight line OR is
4 m. Calculate the
maximum height of
the tunnel. *​

The pyraminx is a rubik's cube-type toy in the shape of a tetrahedron. the pyraminx shown below has edges 15\,\text{cm}15cm long and vertical height h=12.2\,\text{cm}h=12.2cm. the triangle drawn with dashed lines is a right triangle. what is the distance rr? round your answer to the nearest tenth.