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1+2+3+4+5+6+7+8+9+10+11…… +What is 49 + 50
(1 + 50) X50 divided by 2 = 1275
The sum of the complementary angle of an angle and the complementary angle of a 50 degree angle is equal to three times of this angle. Find the complementary angle of this angle
Let this angle be x degrees, then the complement of this angle is (180-x) degrees, then:
（180-x)+(90-50=3x
The solution is: x = 55 degree
That is, the complement of this angle is 180-x = 180-55 = 125 degrees
If an angle is more than twice the complement angle, the range of angle and complement angle can be calculated
Angle range (120180) complementary angle range (0,60)
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