# Show that (4, 3) is the centre of the circle which passes through the points (9, 3), (7, –1)and (1, –1). Find also its radius

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by LikhaSathe

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by LikhaSathe

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SB = (4-7)² + (3+1)² =-3² +4² = 9 +16 =25 UNITS

SC = (4-1)² + (3 +1)² = 3² + 4² = 9 + 16 = 25 UNITS

SA=SB=SC

THEREFORE (4,3) IS THE CENTRE OF THE CIRCLE

RADIUS=25 UNITS