Question

define polyhedron and l.s.a

Answer 1

a solid figure with many plane faces, typically more than six is a polyhedron.
The lateral surface of an object is the area of all the sides of the object, excluding the area of its base and top.

Answer 2

Answer:

Step-by-step explanation:Area of cross section of river= 2 x 45 = 90 m²

so, water flowing into the sea= area of cross section x rate of flowing water

= 90 x 3000

= 270000 m³

there water flowing per minute= 270000 / 60 = 4500 m³