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Elementary Geometry for College St...

6th Edition
Daniel C. Alexander + 1 other
ISBN: 9781285195698

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BuyFindarrow_forward

Elementary Geometry for College St...

6th Edition
Daniel C. Alexander + 1 other
ISBN: 9781285195698
Textbook Problem
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G i v e n :           O   w i t h   t a n g e n t   l   a n d   m 5 = 40 °

          F i n d :             m 1 ,     m 2 , m 3 ,     m 4 ,

Chapter 6.CR, Problem 12CR, Given:Owithtangentlandm5=40 Find:m1,m2, m3,m4,

To determine

To find: m1,m2, m3, m4

Explanation

Theorem:

1) An angle inscribed in a semicircle is a right angle.

2) The measure of an angle formed by a tangent and a chord drawn to the point of tangency is one-half the measure of the intercepted arc.

3) The measure of an inscribed angle of a circle is one-half the measure of its intercepted arc.

Calculation:

Given that

m5=40° and l is tangent to the circle at point B.

By theorem, An angle inscribed in a semicircle is a right angle.

m3 is inscribed in a semicircle.

So, m3=90°.

Since, sum of the three angles in a triangle is 180°

In ABC, m1+m5+m3=180°

Let m5=40°,m3=90°

40°+m1+90°=180°

m1+130°=180°

Subtract 130°, m15+130°-130°=180°-130°

So, m1=50°

And m1=50° is the angle intercepted by the arc AB^

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