Warm up. Review HW Skills Check P A B Case I: Central Angle: Vertex is AT the center 

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Presentation transcript:

Warm up

Review HW

Skills Check

P A B Case I: Central Angle: Vertex is AT the center 

Case II: Inscribed Angle: Vertex is ON circle ANGLE ARC ANGLE ARC  

160  80  The arc is twice as big as the angle!!

120  x y Find the value of x and y   

Examples 1. If m JK = 80  and  JMK = 2x – 4, find x. M Q K S J 2. If m  MKS = 56 , find m MS. x = 

72˚ If two inscribed angles intercept the same arc, then they are congruent. Find the measure of  DOG and  DIG D O G I

If all the vertices of a polygon touch the edge of the circle, the polygon is INSCRIBED and the circle is CIRCUMSCRIBED.

a quadrilateral inscribed in a circle: opposite angles are supplementary. A B C D

If a right triangle is inscribed in a circle then the hypotenuse is the diameter of the circle. diameter

Example 3 In  J, m  3 = 5x and m  4 = 2x + 9. Find the value of x. 3 Q D J T U 4 x = 3

4x – 14 = 90 H K G N Example 4 In  K, GH is a diameter and m  GNH = 4x – 14. Find the value of x. x = 26 Bonus: What type of triangle is this? Why?

z y y =180 y = 70 z + 85 = 180 z = 95 Example 5 Find y and z.

Practice WS Get in your groups please. 12 problems

Homework WS Day 21 Inscribed Angles Choose even or odd problems