The drawing technique of using dots instead of lines called stippling. Using lines instead of dots on the other hand is called hatching. Stippling involves placing individual dots across a surface in a pattern that will be identifiable. Individual dots are used to imply the shape, texture, or shadowing of a subject.
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These are in 2/4 time. They have two beats per measure. Remember that an eighth not equals one half of a beat, a quarter not equals one beat, a half note equals two beats, and a whole note equals four beats. To make these measures in 4/4 (four beats per measure) you would have to add four eight notes, two quarter notes, or one half note to each measure.
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Try emailing your counselor or principal. Their email may be on your school's website.
