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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 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.
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.
a flat PLAIN is a flat area of land
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.