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How can a megaphone used by a cheerleader allow people on the opposite side of a field to hear her better?

How can a megaphone used by a cheerleader allow people on the opposite side of a field to hear her better?
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How can a megaphone used by a cheerleader allow people on the opposite side of a field to hear her better?

User Evgeni Nabokov
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The megaphone is cupping the area around her mouth and it is like with your hands, if you cover around them the noise will be louder. It is because it is hollow and there isn't anything to block the noise through the megaphone.
User Alias Varghese
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