Proofs concerning equilateral triangles About Transcript Sal proves that the angles of an equilateral triangle are all congruent (and therefore they all measure 60Â°), and conversely, that triangles with all congruent angles are equilateral.
Lung disorders or diseases in which a hyperresonant sound is heard upon percussion. small pneumothorax, lung hyperinflation due to emphysema or acute asthma attack.
percussion sound any sound obtained by percussion. physiological s's those heard when an external acoustic meatus is plugged, caused by the rush of blood through blood vessels in or near the inner ear and by adjacent muscles in continuous low-frequency vibration. respiratory s's breath sounds.