Answer:
five
Step-by-step explanation:
when putting the image into a net you can count 5 sides

- An isosceles triangle ABC
- AD is a bisector of ∠A
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- By ASA criteria ∆ABD congurant to ∆ADC
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- By CPCT ( corresponding parts of congurant triangle )

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Next it would be 5,5,5,5,5. Because, when you go up one in numbers you also go up one the amount.
No, It's not.
coefficients for perfect square would be:
3² - 2(3)(6) + 6² = 9 - 36 + 36