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EXAMPLE 2

The chords JL and KM intersect inside the circle. ( m JM + m LK ). x o. =. 12. 12. x o. ( 130 o + 156 o ). =. x o. = 143. EXAMPLE 2. Find an angle measure inside a circle. Find the value of x. SOLUTION. Use Theorem 10.12. Substitute. Simplify.

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EXAMPLE 2

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  1. The chords JLand KMintersect inside the circle. (mJM + mLK) xo = 12 12 xo (130o + 156o) = xo = 143 EXAMPLE 2 Find an angle measure inside a circle Find the value of x. SOLUTION Use Theorem 10.12. Substitute. Simplify.

  2. The tangent CDand the secant CBintersect outside the circle. (mAD – mBD) m BCD = 12 12 xo (178o – 76o) = x = 51 EXAMPLE 3 Find an angle measure outside a circle Find the value of x. SOLUTION Use Theorem 10.13. Substitute. Simplify.

  3. The Northern Lights are bright flashes of colored light between 50 and 200 miles above Earth. Suppose a flash occurs 150 miles above Earth. What is the measure of arc BD, the portion of Earth from which the flash is visible? (Earth’s radius is approximately 4000 miles.) EXAMPLE 4 Solve a real-world problem SCIENCE

  4. Because CBand CDare tangents, Also,BC DC and CA CA . So, ABC ADC by the Hypotenuse-Leg Congruence Theorem, and BCA DCA.Solve rightCBA to find thatm BCA 74.5°. (mDEB – mBD) m BCD = CB AB and CD AD 12 12 149o [(360o – xo) –xo] xo 31 The measure of the arc from which the flash is visible is about 31o. ANSWER EXAMPLE 4 Solve a real-world problem SOLUTION Use Theorem 10.13. Substitute. Solve for x.

  5. ANSWER y = 61o for Examples 2, 3, and 4 GUIDED PRACTICE 4. Find the value of the variable.

  6. ANSWER a = 104o for Examples 2, 3, and 4 GUIDED PRACTICE Find the value of the variable. 5.

  7. ANSWER xo 253.7o for Examples 2, 3, and 4 GUIDED PRACTICE 6. Find the value of the variable.

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