(c) The y-axis is the line of symmetry for the figure ABCD, where A. B

1.	(c) The y-axis is the line of symmetry for the figure ABCD, where A. B have coordinates (3. o) (-3, 4)131respectively0) Find coordinates of C and D(i) Name the figure ABCD and find its area.141ICSE Self-Study in Mathematics 10(384
Answer» Assuming C and D are reflections of A and B(respectively) Therefore A on reflection by Y-axis = C co-ordinates= (-(3), 6)= (-3,6) Therefore B on reflection by Y-axis = D co-ordinates= (-3, -(4))= (-3,-4) Figure ACBD is a rectangle. (you need to plot the points on a graph) Area = lengthbreadthOn observing graph, length = 6 unitsbreadth = 2 units Therefore, area = 62 = 12 sq.units

(c) The y-axis is the line of symmetry for the figure ABCD, where A. B have coordinates (3. o) (-3, 4)131respectively0) Find coordinates of C and D(i) Name the figure ABCD and find its area.141ICSE Self-Study in Mathematics 10(384

Answer»

Assuming C and D are reflections of A and B(respectively)

Therefore A on reflection by Y-axis = C co-ordinates= (-(3), 6)= (-3,6)

Therefore B on reflection by Y-axis = D co-ordinates= (-3, -(4))= (-3,-4)

Figure ACBD is a rectangle. (you need to plot the points on a graph)

Area = length*breadthOn observing graph, length = 6 unitsbreadth = 2 units

Therefore, area = 6*2 = 12 sq.units