Heron’s formula: Area =

The hypotenuse of a 45°-45°-90° triangle measures units.



The lengths of two sides of a right triangle are 5 inches and 8 inches. What is the difference between the two possible lengths of the third side of the triangle? Round your answer to the nearest tenth.
An acute triangle has side lengths 21 cm, x cm, and 2x cm. If 21 is one of the shorter sides of the triangle, what is the greatest possible length of the longest side, rounded to the nearest tenth?
Which trigonometric ratios are correct for triangle DEF? Select three options.





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