Big Ideas Math Integrated I, 2016
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Big Ideas Math Integrated I, 2016 View details
1. Angles of Triangles
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Exercise 23 Page 593

15^(∘) and 75^(∘)

Practice makes perfect

We know that the measure of one of the acute angles in a right triangle is 5 times the measure of the other acute angle in the triangle. Let's illustrate this information with a diagram.

We want to find the measure of each acute angle. To do so, we will let x be the measure of the smaller acute angle. Then, the measure of the larger acute angle is 5x. According to the Corollary to the Triangle Sum Theorem, the acute angles of a right triangle are complementary. This means that the sum of the measures of each acute angle has to be equal to 90. 5x+x=90 We will use the equation to find the value of x. Let's do it!

5x+x=90
6x=90
x=15

The measure of the smaller acute angle is 15^(∘). Now we can find the measure of the greater acute angle by substituting this value into the expression 5x.

5x
5( 15)
75

The measure of the larger acute angle is 75^(∘).