Big Ideas Math Integrated I, 2016
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Big Ideas Math Integrated I, 2016 View details
2. Congruent Polygons
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Exercise 2 Page 597

Corresponding angles have equal measures and corresponding sides have equal lengths.

x=25

Practice makes perfect

Let's analyze the given diagram, where ABGH ≅ CDEF.

We want to find the value of x. To do so, we will use the fact that corresponding angles have equal measures and corresponding sides have equal lengths. From the given congruence statement, we know that angle H is congruent to angle F. This means that both angles have the same measure. m∠ H = m∠ F We will substitute m∠ H= 4x+5 and m∠ F= 105 into the above equation and solve for x. Let's do it!
m∠ H=m∠ F
4x+5= 105
4x=100
x=25
Therefore, the value of x is 25.

Checking Our Answer

Checking Our Answer
To check our answer, we will substitute the value of x into the given expression for angle H and see if it is equal to 105. Let's do it!
4x+5
4( 25)+5
100+5
105
We get that m∠ H=105. Therefore, our answer is correct. More information about the concepts shown in this solution can be found on the following pages.