If a shape is said to be concave, it means that it is possible to have two points that to connect, need a straight line segment that must cross outside of the shape. An example would be a cross....
Carefully is the studio album by Najwa
The term 'peruse' means examine or consider with attention and in detail
Carelessly
It only applies to male turtles. They have a concave down bottom shell to make mating easier.