a yield sign
The hands of a clock at 5 to 12
A right angle triangle always has 2 acute angles within it.
One example I know is an ice cream cone.
a pizza slice yumm!(;
A roof (:
An angle formed as a see-saw is a real life example.
cycle foces
Roof of a house
a wooden gate
blinds or window panes
2 o'clock on a wristwatch.