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OpenStudy (anonymous):
Two regular pentagons have areas of 20 mm² and x² - x mm². What values of x make the pentagons congruent?
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OpenStudy (mathstudent55):
Solve x^2 - x = 20 for x.
OpenStudy (jdoe0001):
for the 2 figures to be congruent, they'd have to be equal to each other, thus equate one quantity to the other and solve for "x"
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