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13-02-2022
Mathematics

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13-02-2022

Answer:

15

Step-by-step explanation:

Using the formula:

[tex]P = 2 (a+b)[/tex]
where P is the perimeter, b is base and a is side lengths

Solving for a:

[tex]a = \frac{P}{2} - b[/tex]

[tex]a = \frac{70}{2}-20[/tex]

[tex]a =15[/tex]

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