explain how to find the length of a side using the methods in this section.

A square television screen measures 20 inches on the diagonal
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?????????????????? "measures twenty" ????? yu meen its 20 ???????????

old TV's had skreens 4 wide bi 3 h, sd diagonal=5

so diagonal=20 is 4*5

thus, wide=4*4=16

hite=3*4=12
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