Answer:
3 x 21
20 x 4 tenths
21 x thirteenth
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Answer:

Step-by-step explanation:
Given 2 similar figures with ratio of sides = a : b, then
ratio of areas = a² : b²
Here ratio of sides = 52 : 68 = 13 : 17 ← in simplest form, thus
ratio of areas = 13² : 17² = 169 : 289 = 
+ + + + + +
4 is positive or + and so is 2
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