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 tinhs reduction?
tinhs reduction is
incorrect; he should have
only divided the angle
measures by 3.
tinhs reduction is
incorrect; he should have
multiplied the side
lengths by 3 instead.
tinhs reduction is
incorrect; he should have
only divided the side
lengths by 3.
tinhs reduction is
incorrect; he should have
multiplied the angle
measures by 3 instead.

Explanation:

When reducing a triangle (a geometric figure), the side - lengths are scaled. For similar triangles (which is what we get when we scale a triangle), the angles remain the same. So, Tinh should only divide the side lengths by 3 (or multiply by \(\frac{1}{3}\)), and the angle measures should stay unchanged.

Answer:

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