Answer:
4. 11/6, 121/36
5. 5/8, 25/64
6. 4/7, 16/49
7. 14/9, 196/81
Explanation:
The ratio of perimeters is the same as the ratio of corresponding legs:
perimeter ratio = red leg/blue leg
The area ratio is the square of that:
area ratio = (perimeter ratio)²
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4.
perimeter ratio = 11/6
area ratio = (11/6)² = 121/36
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5.
perimeter ratio = 5/8
area ratio = (5/8)² = 25/64
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6.
perimeter ratio = 4/7
area ratio = (4/7)² = 16/49
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7.
perimeter ratio = 14/9
area ratio = (14/9)² = 196/81