If tow sides of a triangular flag are content, which of the following words can not be used describe the shape of the flag?

a. Obtuse
b. Acute
c. Scalene
d. Equilateral

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To determine which of the given words cannot be used to describe the shape of the flag, we need to analyze the characteristics of each word and compare them to the concept of a triangular flag.

a. Obtuse: This term refers to an angle greater than 90 degrees. A triangular flag can have an obtuse angle, so this word can be used.

b. Acute: This term describes an angle less than 90 degrees. A triangular flag can have acute angles, so this word can be used.

c. Scalene: This word refers to a triangle with no equal sides or angles. Since a triangular flag can have different lengths for its sides, this word can be used.

d. Equilateral: This term describes a triangle with all sides and angles equal. A triangular flag typically does not have all sides equal in length, so this word cannot be used.

Therefore, the correct answer is:

d. Equilateral