Two similar triangles have sides in the ratio 9 : 5. What is the ratio of their perimeters?
Options
A
2 : 7
B
7 : 2
C
5 : 9
D
9 : 5
Answer & Analysis
Answer
D
Analysis
Question Analysis
This question focuses on the relationship between the perimeters of similar triangles. Given the ratio of corresponding side lengths, the task is to determine the ratio of their perimeters.
Key Concept Explanation
For similar triangles, the ratio of the perimeters is equal to the ratio of the corresponding side lengths. This is because the perimeter of a triangle is the sum of its side lengths. If each side of one triangle is in a certain ratio to the corresponding side of a similar triangle, then the sum of these side lengths (the perimeter) will be in the same ratio.
Step - by - Step Solution
1. Let the side lengths of the first triangle be , , and the side lengths of the second triangle be , , .
We are given that .
2. The perimeter of the first triangle , and the perimeter of the second triangle .
Then
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