Question

Tinh has a triangle with side lengths 12 mm, 15 mm, and 18 mm. He wants to reduce the triangle by one-third, so he divides each side length and each angle measure by 3. Which describes Tinh’s reduction? Tinh’s reduction is incorrect; he should have only divided the side lengths by 3. Tinh’s reduction is incorrect; he should have only divided the angle measures by 3. Tinh’s reduction is incorrect; he should have multiplied the side lengths by 3 instead. Tinh’s reduction is incorrect; he should have multiplied the angle measures by 3 instead.

Answer 1

Explanation:

Tinh has a triangle with side lengths 12 mm, 15 mm, and 18 mm. He wants to reduce the triangle by one-third, so he divides each side length and each angle measure by 3. Which describes Tinh’s reduction?

Tinh’s reduction is incorrect; he should have only divided the side lengths by 3.

Tinh’s reduction is incorrect; he should have only divided the angle measures by 3.

Tinh’s reduction is incorrect; he should have multiplied the side lengths by 3 instead.

Tinh’s reduction is incorrect; he should have multiplied the angle measures by 3 instead.

Answer 2

Tinh's reduction is incorrect; he should have only divided the side lengths by 3.

Dividing the angle measures by 3 would make it into a completely different triangle. He just wants to dilate the triangle (make it smaller), not change everything about it. Dividing only the side lengths will make the triangles similar figures.