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Omni-MATH / Regular octagon CHILDREN has area 1. Find the area of pentagon CHILD.

Problem

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problem

Regular octagon CHILDRENC H I L D R E N has area 1. Find the area of pentagon CHILDC H I L D.
Plain-text mathematical notation (without MathML)
Regular octagon CHILDREN has area 1. Find the area of pentagon CHILD.
Original LaTeX notation
Regular octagon $C H I L D R E N$ has area 1. Find the area of pentagon $C H I L D$.

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