The exterior angle formed by the letter "V". Notice how this shape is commonly used; for example the wings on a stealth bomber or an arrowhead have this shape.
a wooden gate
the rooftops of most houses or buildings
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There are many examples that shows the exterior of an angle. The most common example would be of a four way stop.
it would be 180 A perfectly straight line would be an example - like the edge of a ruler. Or a plumb line.
A roof (:
An angle formed as a see-saw is a real life example.
cycle foces
a wooden gate
Roof of a house
a yield sign
blinds or window panes
2 o'clock on a wristwatch.
An acute angle can be found in the shape of a corner in a room, where two walls meet to form an angle that measures less than 90 degrees.
the rooftops of most houses or buildings
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The hands of a clock at 5 to 12