3a.
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a = 40°
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(alternate angles on parallel lines are equal) |
|
b = 66°
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(alternate angles on parallel lines are equal) |
|
x = 8 cm
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(opposite sides of a parallelogram are equal length) |
3b.
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c = 3.2 cm
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(opposite sides of a rectangle are equal length) |
|
d = 19°
|
(angle sum of triangle is 180°) |
|
e = 71°
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(alternate angles on parallel lines are equal) |
3c.
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c = 11 cm
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(opposite sides of a rhombus are equal length) |
|
f = 31°
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(opposite angles in a rhombus are equal) |
|
h = i = 74.5°
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(base angles of isosceles triangle are equal) |
|
g = 74.5°
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(alternate angles on parallel lines are equal) |
3d.
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p = 11 cm
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(adjacent sides of kite are equal length) |
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m = 90°
|
(intersecting diagonals of a kite) |
|
n = 31°
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(symmetry properties of a kite) |
|
o = 59°
|
(angle sum of triangle is 180°) |
3e.
|
q = 75°
|
(co-interior angles on parallel lines) |
|
r = 29°
|
(alternate angles on parallel lines are equal) |
3f.
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v = 3.9 m
|
(symmetry properties of an arrowhead) |
|
x = 90°
|
(intersecting diagonals of an arrowhead) |
|
z = 76°
|
(symmetry properties of an arrowhead) |
|
w = 61°
|
(angle sum of triangle is 180°) |
|
y = 14°
|
(angle sum of triangle is 180°) |