A regular decagon has 10 sides. A decagon has 10 equal sides.

How many reflectional symmetries does a regular decagon have?

5
10
15
20

Sink holes may eventually for to join a. wide valleys b. zone of aeration c. dripstones d. aquifer

The oldest seafloor in the atlantic ocean is located closest to the edge of the continents. explain how this age can be used to figure out when north america first began to separate from europe

Plz answer ! find the alps. what countries and country borders intersect this major mountain range? which borders seem to be defined by the edges of the mountains? which borders seem to be defined by the edges of the mountains? which borders cut across the mountains?