An acute angle.
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It is a right angle triangle because it has a 90 degree angle and the 3 angles add up to 180 degrees.
180 - 31 = 149o
90 - 31 = 59 degree
the 30 degree angle is near the equator and the 90 degree angle is near the trop of Capricorn and cancer
155 feet = 31 x 5