( ( The shell ) ( ( was ( ( ( convex and ) shaped ) ( like ( ( a triangle ) ( with ( rounded corners ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN shell)) (VP (VBD was) (VP (VBN convex) (CC and) (VBN shaped) (PP (IN like) (NP (NP (DT a) (NN triangle)) (PP (IN with) (NP (JJ rounded) (NNS corners))))))) (. .)))
The shell was convex and shaped like a triangle with rounded corners.
(ROOT (S (NP (DT A) (NN convex) (NN mirror)) (VP (VBZ is) (VP (VBN shaped) (PP (IN like) (NP (NP (DT the) (NN outside)) (PP (IN of) (NP (DT a) (NN bowl))))))) (. .)))
A convex mirror is shaped like the outside of a bowl.