Contour lines are imaginary lines that join points of equal height. Therefore, say, a 300 metre height contour line can never meet a 400 metre height one.
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Yes and certainly so when it's in the form of an equliateral triangle which has 3 lines of symmetry
Two parallel lines bisected by a straight line can produce three angles. Angles on the one side or 'inside' are corresponding. They can also be co-interior, in that they add up to 180-degrees. Opposite side one are called alternate angles.
There is no specific name. Using a single straight line, a rectangle can be halved into triangles, smaller rectangles, or pentagons. There are infinitely many possibilities using more than one lines in the cut.
you can split a regular hexagon into 6 triangles
The hexagon can be split into 8 equal trapezoids by creating a smaller hexagon (exactly one half the size) within the hexagon. Draw lines through the center of the hexagon from opposing vertices, and connect the midway points. The space between the two hexagons is filled by six equal trapezoids, and the smaller hexagon bisects to form two more. (see the related link for drawing)