Chapter 8.2, Problem 27E

### Elementary Geometry For College St...

7th Edition
Alexander + 2 others
ISBN: 9781337614085

Chapter
Section

### Elementary Geometry For College St...

7th Edition
Alexander + 2 others
ISBN: 9781337614085
Textbook Problem

# In Exercises 27 to 30, find the area of the figure shown. Given: In ⊙ O , O A = 5 , B C = 6 , a n d C D = 4 Find: A A B C D

To determine

To Find:

The area of the quadrilateral ABCD inscribed by the circle with centre 'O'.

Explanation

Formula Used:

Angle subtended by a diameter on any point of circle is 90Â°.

Pythagorean theorem for the right angle triangle âˆ†ABC for the hypotenuse AC,

AC2=AB2+BC2.

Area of right triangle =12Ã—bÃ—h

Calculation:

This quadrilateral can be divided into two triangles. That is, âˆ†ABC and âˆ†ADC.

By the angle subtended in a diameter of the circle theorem, it makes 90Â° at the mâˆ D and mâˆ B.

It is given that OA=5=radius, BC=6 and CD=4.

CA=10

Consider the âˆ†ABC,

Here BC=6 and CA=10. Applying Pythagorean theorem,

CA2=AB2+BC2

102=AB2+62

AB2=100-36

AB=8 units

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