Q21 of 84 Page 114

If origin is the center of a circle with radius 17 units, find the coordinates of any four points on the circle which are not on the axes. (Use the Pythagorean triplets)

Formula used:


Let the point be A (x, y)


Center is at origin (0, 0)


Distance of OA


OA = √((x – 0)2 + (y – 0)2)


OA = √ ((x)2 + (y)2)


OA = √ x2 + y2


Squaring both sides


(0A)2 = x2 + y2


(17)2 = x2 + y2


Using Pythagorean triplet


x and y can 8 and 5 or vice–a–versa.


x = ± 8 or ±15


y = ± 8 or ±15


Hence, coordinate on circle other than coordinates on axis are


(8, 15), (–8, –15), (–8, 15) and (8, –15)


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