exam Maths Puzzle Numerical Ability

how to find the area of a L shaped room

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exam Other Question

The equation below is a circle. What is the y-coordinate of the center of the circle?

(x - 6)^2 + (y + 5)^2 = 15^2

my initial awnser was 5 but i was wrong
Use the point-slope form to find a general form of the equation of the line whose slope is -1/3 and that passes through (2,3).