Homothety and constructing similar polygons
Answers are for parents and teachers.
1
The centre is the origin and k = 2. What is the y-coordinate of the image of D(−4; 3)?
6
2
A triangle has sides 3, 5, 6. What is the perimeter of its image under a homothety with k = 4?
56
3
Under a homothety a square's area changes from 16 cm² to 4 cm². What is k?
1/2
4
OA = 9 cm and OA₁ = 3 cm. Find the coefficient of the homothety.
1/3
5
Why are corresponding sides of homothetic triangles parallel?
Triangles OXY and OX₁Y₁ are similar, corresponding angles are equal, hence XY ∥ X₁Y₁.