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What is a rectangle with no sides?
A rectangle with no sides is no longer a rectangle as a rectangle HAS 4 sides. The x-y plane is an infinite flat area with no limits (sides) to it.
A high uplifted area with steep slopes?
A mountain is a high, uplifted area with steep slopes. Mountains are large elevated area that rises from level ground. They are large and steep hills.
What is the meaning of the sides of a polygon?
A polygon is a closed plane (flat) shape where an area is enclosed by a number of straight lines that meet, two at a time. These straight lines form the boundary of the polygon and are called its sides.
What is flat plane?
a flat PLAIN is a flat area of land
What is the area of a triangle whose sides measure 30 meters 70 meters and 40 meters?
Zero. The two shorter sides together make 70 metres, so they lie flat against the longest side. Really, there is no triangle. If the 3 sides actually make a triangle, you can use Heron's formula - look it up - to find the area.
