We can use the Pythagorean Theorem to find the length of a side of a right triangle when we know the lengths of the other two sides.
In a right triangle, the sum of the squares of the lengths of the legs is equal to the square of the length of the hypotenuse.
If a and b are legs and c is the hypotenuse, then
a2 + b2 = c2
Problem 1 :
In the right triangle given below, find the length of the missing side using Pythagorean theorem.
Solution :
Step 1 :
If a and b are legs and c is the hypotenuse, write Pythagorean for the above right triangle
a2 + b2 = c2
Step 2 :
Substitute the given measures.
72 + 242 = c2
Step 3 :
Solve the equation for c.
72 + 242 = c2
Simplify.
49 + 576 = c2
625 = c2
Write 625 as a perfect square (625 = 252).
252 = c2
Get rid of the square on both sides.
25 = c
Hence, the length of the hypotenuse is 25 inches.
Problem 2 :
In the right triangle given below, find the length of the missing side using Pythagorean theorem.
Solution :
Step 1 :
If a and b are legs and c is the hypotenuse, write Pythagorean for the above right triangle
a2 + b2 = c2
Step 2 :
Substitute the given measures.
a2 + 122 = 152
Step 3 :
Solve the equation for c.
Simplify.
a2 + 144 = 225
Subtract 144 from both sides.
a2 = 81
Write 81 as a perfect square (81 = 92).
a2 = 92
Get rid of the square on both sides.
a = 9
Hence, the length of the leg is 9 centimeters.
Problem 3 :
In the right triangle given below, find the length of the missing side using Pythagorean theorem.
Solution :
Step 1 :
If a and b are legs and c is the hypotenuse, write Pythagorean for the above right triangle
a2 + b2 = c2
Step 2 :
Substitute the given measures.
302 + 402 = c2
Step 3 :
Solve the equation for c.
302 + 402 = c2
Simplify.
900 + 1600 = c2
2500 = c2
Write 2500 as a perfect square (2500 = 502).
502 = c2
Get rid of the square on both sides.
50 = c
Hence, the length of the hypotenuse is 50 ft.
Problem 4 :
In the right triangle given below, find the length of the missing side using Pythagorean theorem.
Solution :
Step 1 :
If a and b are legs and c is the hypotenuse, write Pythagorean for the above right triangle
a2 + b2 = c2
Step 2 :
Substitute the given measures.
a2 + 402 = 412
Step 3 :
Solve the equation for c.
Simplify.
a2 + 1600 = 1681
Subtract 1600 from both sides.
a2 = 81
Write 81 as a perfect square (81 = 92).
a2 = 92
Get rid of the square on both sides.
a = 9
Hence, the length of the leg is 9 inches.
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