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Question
The triangle A(1, 2), B(4, 4) and C(3, 7) is first reflected in the line y = 0 onto triangle A’B’C’ and then triangle A’B’C’ is reflected in the origin onto triangle A” B” C”. Write down the co-ordinates of:
A',B',C'.
Solution
A' → (1, -2),
B' → (4, -4),
C' → (3, -7).
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The points P (1,-1 ), Q ( 4,-1) and R ( 4, 3) are reflected in y-axis. If the images are denoted byP' , Q' , and R' , then
(i) Find the co-ordinates of P'Q'R' , Q' and R'
(ii) What kind of figure is formed by RR' Q' Q?
(iii) Find the perimeter of the figure P'Q'R'
The triangle A(1, 2), B(4, 4) and C(3, 7) is first reflected in the line y = 0 onto triangle A’B’C’ and then triangle A’B’C’ is reflected in the origin onto triangle A” B” C”. Write down the co-ordinates of:
A'',B'',C''.
The point P (a, b) is first reflected in the origin and then reflected on the Y-axis to p’. If P’ has co-ordinates (3, – 4), evaluate a, b.
