right angle, , obtuse angle, , acute angle, , perpendicular line, , parallel line, , 9.27, , 1h 30 min, 90 min, 4h 13 min, 253 min, 100 min, 1h 40 min, 263 min, 4h 23 min, 1/2+ 1/2=, 1 whole, The numerator is 7,the denominator is 10, 7/10, 1/4, 2/8=3/12=4/16, 5/8 is greater than , 4/9, 3/8 is smaller than , 1/2.

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