Draw and label all three side lengths and angle measures of a right triangle that has a 40° angle and a hypotenuse 10 cm long. Explain how you calculated each missing angle measure and segment length.

Right Triangles and the Pythagorean Theorem

1.The Pythagorean Theorem, a2+b2=c2, a 2 + b 2 = c 2 , can be used to find the length of any side of a right triangle.

2.The side opposite the right angle is called the hypotenuse (side c in the figure).