Do you have a microwave?(hint hint!) they use microwaves to cook food.
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a real life example of waves is a sound wave, sound can travel through the air, but it does need a medium. another example is light waves such as the sun the sun gives us light so it is called light waves.
A laser, light from a flashlight, and radio waves are all rays
waves
it is a convex mirror as it produces diverging waves
360 degrees or 2(pi) radians