McGraw Hill Integrated II, 2012
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McGraw Hill Integrated II, 2012 View details
3. Special Right Triangles
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Exercise 2 Page 644

Notice that the given figure is a 45^(∘)-45^(∘)-90^(∘) triangle.

7sqrt(2)

Practice makes perfect

Notice that the given right triangle has a marked angle measuring 45^(∘). Therefore, by the Triangle Angle Sum Theorem, the measure of the third angle must also be 45^(∘).

In a 45^(∘)-45^(∘)-90^(∘) triangle, the legs are congruent and the hypotenuse is sqrt(2) times the length of a leg. With this information, we can write an equation that can be solved for x. 14 = sqrt(2) * x Let's solve the above equation for x!

14 =sqrt(2) * x
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Solve for x
14/sqrt(2)=x
14sqrt(2)/sqrt(2)* sqrt(2)=x
14sqrt(2)/2=x
7sqrt(2)/1=x
7sqrt(2)=x
x=7sqrt(2)