Question

Determine the measure of angle ECB.

Answer 1

Answer:

You are correct 91.75 is the answer

Step-by-step explanation:

This is a cyclic quadralterial since all the. vertices of the quadralterials touch the circle circumference. Opposite angles are supplementary in cyclic quadralterials. Angle C and Angle D are opposite angles so

$7x + 20 + 9x - 4 = 180$

$16x + 16 = 180$

$16x = 164$

$x = 10 \frac{4}{16}$

$x = 10.25$

Plug 10.25 into 7x+20

$7(10.25) + 20 = 91.75$

You are correct

Answer 2

Answer:

4) 91.75

Step-by-step explanation:

7x+20+9x-4=180

16x=164

x=10.25

7(10.25)+20=

71.75+20=91.75