book Maths Puzzle Numerical Ability

Triangle ABC has vertices A(0,4), B(1,2), and C(4,6). Determine whether triangle ABC is a right triangle. Explain.

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book Other Question

The ratio of adult tickets to student tickets for the school play was four to five. If the sum of the adult tickets and one half of the students tickets is 260, how many adult tick Find an equation of the line (in either general form or slope intercept form) that contains the centers of the following two circles:

x^2+y^2-4x+6y+4 = 0 and x^2+y^2+6x+4y+9 = 0