3-3: TEKS Practice

• 1. Which figure shows an adjacent complement for the given angle?

• A.

• B.

• C.

• 2. Think About the Process

• a. How do you decide if the angles shown are complementary?

• A. If the sum of the angles is greater than 180°, the angles are complementary.

• B. If the sum of the angles is 180°, the angles are complementary.

• C. If the sum of the angles is 90°, the angles are complementary.

• D. If the sum of the angles is greater than 90°, the angles are complementary.

• b. Are the angles shown complementary angles? If not, what should the measure of ∠ 1 be so that the angles are complementary?

• A. Yes, the angles are complementary.

• B. No, the angles are not complementary. The measure of ∠ 1 should be °.

• 3. Find the measure of the complement of an 18° angle.

• 4. Estimation ∠ 1 and ∠ 2 are complementary angles. The measure of ∠ 1 is 58°. The measure of ∠ 2 is 10x°. Estimate the value of x by rounding the measure of ∠ 1 to the nearest ten degrees. The figure is not drawn to scale.

• 5. Think About the Process ∠ 1 and ∠ 2 are complementary angles. The measure of ∠ 1 is 58°. The measure of ∠ 2 is (2x + 16)°. The figure is not drawn to scale.

• a. What should you do first to find the value of x?

• A. Write an equation where the difference of the measures of ∠ 1 and ∠ 2 is equal to 90°.

• B. Write an equation where the sum of the measures of ∠ 1 and ∠ 2 is equal to 180°.

• C. Write an equation where the difference of the measures of ∠ 1 and ∠ 2 is equal to 180°.

• D. Write an equation where the sum of the measures of ∠ 1 and ∠ 2 is equal to 90°.

• b. The value of x is .

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