8: Multiply 8 by the scale factor.
20: Multiply 10 by the scale factor twice, because area is two-dimensional.
28: This is getting smaller, so the scale factor is less than 1.
29: This is getting larger, so the scale factor is more than 1.
38: Because they are the same shape, the corresponding angles are the same for both.
43: Could two isosceles triangles be the same shape? Could they be different shapes?
46: Could two squares be the same shape? Could they be different shapes?
48: Could a right triangle be the same shape as an equilateral triangle? Could they be different shapes?
50: Will the image be the same shape as the bug itself?
58: The total measures of the angles in a triangle is 180°.