McGraw Hill Glencoe Geometry, 2012
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McGraw Hill Glencoe Geometry, 2012 View details
2. The Pythagorean Theorem and Its Converse
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Exercise 38 Page 553

Use the Pythagorean Theorem to find the hypotenuse.

Perimeter: 48 units
Area: 96 square units

Practice makes perfect

We want to find the area and the perimeter of the given triangle. In order to do that, we first need to find the length of its hypotenuse.

Hypotenuse

To find the missing side of the triangle, we will use the Pythagorean Theorem. a^2+b^2=c^2 In the formula, a and b are the legs and c is the hypotenuse of a right triangle. We are given a triangle with a=12 and b=16.
Let's substitute these values into the formula.
a^2+b^2=c^2
12^2+ 16^2=c^2
â–Ľ
Solve for c
144+256=c^2
400=c^2
20=c
c=20
Since a negative side length does not make sense, we only need to consider positive solutions.

Perimeter

The perimeter of a figure is the sum of the side lengths. For a triangle, this is the sum of sides a, b, and c. P=a+b+c To calculate P, we should substitute the given values a= 12, b= 16, and c= 20 into the formula and simplify.
P=a+b+c
P= 12+ 16+ 20
P=48
The triangle's perimeter is 48 units.

Area

Here we will use the formula for calculating the area of a triangle. A=1/2bh Now we substitute the value of the base, b= 16, and the value of the height, h= 12, into the formula to calculate A.
A=1/2bh
A=1/2( 16)( 12)
A=16/2* 12
A=8*12
A=96
The area of the triangle is 96 square units.