Answer:
this is because a quadrilateral is a four sided polygon.
and this means square and rectangle are quadrilaterals.
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The measure of <CAO = 21°
810 is the number that represents the same amount.
Hope this helps :)
a ≈ 14.39
Step-by-step explanation:
7² + a² = 16²
49 + a² = 256
49 - 49 + a² = 256 - 49
a² = 207
√a² = √207
a = 14.3874945699