1. Weiming draws a house.
Mark all the angles in the drawing and fill in the blanks.
(a) How many right angles are there?
(b) How many angles are greater than a right angle?
(c) How many angles are smaller than a right angle?
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Hydroelectricity, or hydroelectric power, is electricity produced from hydropower. In 2015, hydropower generated 16.6% of the world's total electricity and 70% of all renewable electricity, and was expected to increase by about 3.1% each year for the next 25 years.
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