Transformations Composition 2Bc951
1. Problem 6a: Find the composition of transformations $T_{(3,-2)} \circ T_{(1,-1)}$.
2. The rule for composition of translations $T_{(a,b)} \circ T_{(c,d)}$ is:
$$T_{(a,b)} \circ T_{(c,d)} = T_{(a+c, b+d)}$$
3. Applying this rule:
$$T_{(3,-2)} \circ T_{(1,-1)} = T_{(3+1, -2-1)} = T_{(4,-3)}$$
4. Problem 6b: Find the composition $T_{(-4,0)} \circ T_{(-2,5)}$.
5. Using the same rule:
$$T_{(-4,0)} \circ T_{(-2,5)} = T_{(-4-2, 0+5)} = T_{(-6,5)}$$
6. Problem 7: Find the image coordinates after translation.
7. For $T_{(3,-1)}(\triangle ABC)$ with $A(5,0), B(-1,2), C(6,-3)$:
$$A' = (5+3, 0-1) = (8,-1)$$
$$B' = (-1+3, 2-1) = (2,1)$$
$$C' = (6+3, -3-1) = (9,-4)$$
8. For $T_{(-4,0)}(\triangle DEF)$ with $D(3,3), E(-2,3), F(0,2)$:
$$D' = (3-4, 3+0) = (-1,3)$$
$$E' = (-2-4, 3+0) = (-6,3)$$
$$F' = (0-4, 2+0) = (-4,2)$$
9. For $T_{(-10,-5)}(\triangle GHI)$ with $G(0,0), H(3,6), J(12,-1)$:
$$G' = (0-10, 0-5) = (-10,-5)$$
$$H' = (3-10, 6-5) = (-7,1)$$
$$J' = (12-10, -1-5) = (2,-6)$$
10. Problem 8a: Find vertices of $r_{180^\circ; O}(\triangle XYZ)$ with $X(-4,7), Y(0,8), Z(2,-1)$.
11. Rotation by $180^\circ$ about origin transforms $(x,y)$ to $(-x,-y)$:
$$X' = (4,-7), Y' = (0,-8), Z' = (-2,1)$$
12. Problem 8b: Find vertices of $r_{270^\circ; O}(\triangle XYZ)$.
13. Rotation by $270^\circ$ about origin transforms $(x,y)$ to $(y,-x)$:
$$X' = (7,4), Y' = (8,0), Z' = (-1,-2)$$
14. Problem 9: Choose the angle of rotational symmetry for the given star-shaped figure.
15. A star shape typically has rotational symmetry of $72^\circ$ or multiples, but given options are 90, 180, 270, or all.
16. Among these, the star has rotational symmetry of $180^\circ$ (option B).
Final answers:
- 6a: $T_{(4,-3)}$
- 6b: $T_{(-6,5)}$
- 7: $A'(8,-1), B'(2,1), C'(9,-4); D'(-1,3), E'(-6,3), F'(-4,2); G'(-10,-5), H'(-7,1), J'(2,-6)$
- 8a: $X'(4,-7), Y'(0,-8), Z'(-2,1)$
- 8b: $X'(7,4), Y'(8,0), Z'(-1,-2)$
- 9: $180^\circ$ (option B)
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