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If X is another angle, keep in mind that when the figure is a triangle the sum of the angles is 180º (angle1+angle2+angle3=180º) ALWAYS!!
The Ancient Maya<span>. </span>Mayan<span> civilization lasted for more than 2,000 years, but the period from about 300 A.D. to 900 A.D., known as the Classic Period, was its heyday. During that time, the </span>Maya<span> developed a complex understanding of astronomy.</span>
