![neylabaker7489](/avatars/22845.jpg)
neylabaker7489
26.11.2019 •
Mathematics
Me with this its super annoying
i have tried but it wants to be super specific so : (
Solved
Show answers
More tips
- F Food and Cooking How to Make Polendwitsa at Home?...
- F Family and Home Parents or Environment: Who Has the Most Influence on a Child s Upbringing?...
- P Philosophy Unbelievable stories of encounters with otherworldly forces...
- L Leisure and Entertainment How to Choose the Perfect Gift for Men on February 23rd?...
- H Health and Medicine How to Treat Whooping Cough in Children?...
- H Health and Medicine Simple Ways to Lower Cholesterol in the Blood: Tips and Tricks...
- O Other How to Choose the Best Answer to Your Question on The Grand Question ?...
- L Leisure and Entertainment History of International Women s Day: When Did the Celebration of March 8th Begin?...
- S Style and Beauty Intimate Haircut: The Reasons, Popularity, and Risks...
- A Art and Culture When Will Eurovision 2011 Take Place?...
Answers on questions: Mathematics
- M Mathematics 15y+7+17y=2y+70 how many solutions are there...
- M Mathematics What’s negative and positive on y axis and x axis...
- M Mathematics For what numbers of years would the surf shop not be in debt? a. [0, ∞) b. [12, ∞) c. [0, 24] d. (3, 21)...
- M Mathematics What is the answer to this question?...
- M Mathematics I’ve been trying to figure this out....
- M Mathematics Will mark ! 98 make a list to find the gcf of each set of numbers. one set of classic comic books contains 18 books, and the other contains 24 books. each set can be divided...
- M Mathematics Consider 7 x 10 to the 3rd power in a pattern to find the value of the expiration expression...
- M Mathematics Keisha drove 792 miles in 11 hours. at the same rate, how long would it take her to drive 576 miles?...
- M Mathematics Ineed solving this and i got school tomorrow...
- M Mathematics When will the sum of two numbers be zero...
Ответ:
Step-by-step explanation:
Angle CBO = 90 - 2x because the radius meets the tangent at 90°
Angle OCB = Angle CBO= 90 - 2x because base angles of an isosceles triangle are equal (OB and OC are radii - so they are equal)
Angle DCO = Angle CDO = x because base angles of an isosceles triangle are equal. (OC and OD are radii - so they are equal)
Angle BCD = Angle DCO + Angle OCB
So Angle BCD = x + (90 - 2x)
Angle BCD = 90 - x
therefore, Angle DOB = 2 × (90 - x)
Angle DOB = 180 - 2x because the angle at the centre is twice the angle at the circumference.
Angle ODA and Angle OBA are both 90° as the angle between the radius and the tangent is 90°
hence, you can work out Angle DAB because angles in a quadrilateral add up to 180°.
Angle DAB = y
y = 360 - 90 - 90 - (180 - 2x)
expand brackets
y = 360 - 90 - 90 - 180 + 2x
y = 2x (angles in a quadrilateral add up to 360°)
Ответ:
A
Step-by-step explanation: