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19.2 Pythagorean Theorem. A right triangle is a triangle that has a right (90 degree) angle. The 2 sides that form the right angle are called the legs.

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Presentation on theme: "19.2 Pythagorean Theorem. A right triangle is a triangle that has a right (90 degree) angle. The 2 sides that form the right angle are called the legs."— Presentation transcript:

1 19.2 Pythagorean Theorem

2 A right triangle is a triangle that has a right (90 degree) angle. The 2 sides that form the right angle are called the legs of the triangle and the side opposite the right angle is called the hypotenuse. leg hypotenuse

3 The Pythagorean Theorem relates the sides of any right triangle. If a and b represent the legs and c the hypotenuse, then

4 Find the length of the hypotenuse: 24 dm 10 dm c

5 Find the length of the hypotenuse: 3.90 cm 8.00 cm c

6 Find the length of the missing side 18.0 m 25.0 m b

7 Find the length of the missing side 37,800 ft 42,600 ft b

8 How long must a guy wire be to reach from the top of a 15-m telephone pole to a point on the ground 10 m from the foot of the pole? Use the Pythagorean theorem. 10 m 15 m c

9 There are two special right triangles that we will further explore. They are called a 45, 45, 90 right triangle and a 30, 60,90 right triangle. The numbers refer to the measure of the angles in degrees.

10 The 45, 45, 90 triangle is an isosceles triangle which means the two legs have equal measure. leg hypotenuse Since the legs are equal, by the Pyth.Theorem, the hypotenuse has length = leg 45

11 Find the hypotenuse of an isosceles triangle that has equal sides of 2 m. 2 m ? Hypotenuse has length =

12 If the hypotenuse of a 45, 45, 90 triangle is 5 cm long, how long is each leg. 5 cm ? Since hyp = leg

13 An equilateral triangle has 3 equal sides and 3 equal angles that each measures 60 degrees. The height bisects both the angle and opposite side making a 30, 60, 90 triangle ½ side or ½ hypot

14 Applying the Pythagorean Th. to this 30, 60, 90 triangles gives the following relations: x, side opposite 30 or short leg 2x, side opposite right angle or longest side other leg

15 Find the missing measures in ? ? Hyp. = 2(short leg) = 2(7 in) = 14 in Other leg = short leg

16 Find the missing measures cm ? ? Hyp. = 2(short leg) = 2( 4.6in) = 9.2 in Other leg = short leg


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