The following figure shows a circle with centre O

Find the angle r .
A 153°
B 104°
C 76°
D 38°

Please help me to solve this . If you can solve it , can you explain it to me ? I had migraine solving this question . Thank you

Step-by-step explanation:

This is tough! However, using a little bit of logic and playing around with formulas, we can solve this!

We know that an inscribed angle = (1/2) intercepted arc. The arc is directly correlated to the area with 16 degrees.  Therefore, r=(1/2)(16)=8. An inscribed angle counts as long as its sides intersect the circle to form an intercepted arc, and this is not an option given, so I can understand why you're having trouble. I would recommend asking your teacher about this.

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a

for this case we must apply distributive property to the following expression:

the distributive property states that:

then, when applying the property we have to multiply the -2 for each term within the parenthesis: