Question 2 • FL-1205040-M/J Grade 7 Mathematics B -GF
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?
Answer
A
Tinh’s reduction is incorrect; he should have only divided the side lengths by 3.
B
Tinh’s reduction is incorrect; he should have only divided the angle measures by 3.
C
Tinh’s reduction is incorrect; he should have multiplied the side lengths by 3 instead.
D
Tinh’s reduction is incorrect; he should have multiplied the angle measures by 3 instead.
Explanation
A reduction by a scale factor of 1/3 means each side length should be divided by 3. The angles should stay the same because scaling a triangle changes its size, not its angle measures. Therefore, Tinh’s reduction is incorrect because he should have divided only the side lengths by 3, which is choice A.
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