(1/2) * 180 = 90
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30 seconds are one half minute. 60 seconds are one minute.
180, because a full circle is 360 degrees. 360-180=180
Half a circle has 180 degrees
A circle is 360 degrees, so half that is 180.
31.517.5/100 = x/180100 times x = 17.5 times 180100x = 3150100x/100 = 3150/100x = 31.5Check your work by multiplying 180 times 0.175 = 31.5