It takes four times because 45+45=90+45=135+45=180. So all of those angles can make a straight line.
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How many of these 30° angles will fit together to make a straight line?
A straight angle is a line which has an angle of 180 degrees therefore two right angles (90 degrees) make a line.
You can use straight angles to make sure countertops, or walls are straight and in a right formation.
Any two angles whose sum is equal to 90 degrees are called "complementary angles".
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