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04 Sep 2020, 08:00
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
75%
(hard)
Question Stats:
55% (02:08) correct
45%
(02:19)
wrong
based on 245
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Figure NOT drawn to scale.
In the figure above, if the degree measure of a central angle subtending the red arc is \(100°\) and the degree measure of a central angle subtending the blue arc is \(210°\), then what is the value of \(x° - y°\) ?
A. 110°
B. 130°
C. 145°
D. 155°
E. 165°
M37-86
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M37-86
Attachment:
Untitled3.png
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03 Dec 2021, 03:32
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Official Solution:
In the figure above, if the degree measure of a central angle subtending the red arc is \(100°\) and the degree measure of a central angle subtending the blue arc is \(210°\), then what is the value of \(x° - y°\) ?
A. \(110°\)
B. \(130°\)
C. \(145°\)
D. \(155°\)
E. \(165°\)
We need the following properties to solve this question:
An inscribed angle is exactly half the corresponding central angle.
Since the red arc is \(100°\), then inscribed angle that subtends this arc will be half of that, so \(50°\).
Since the blue arc is \(210°\), then inscribed angle that subtends this arc will be half of that, so \(105°\).
Check the image below:
The measure of an exterior angle of a triangle is equal to the sum of the measures of the two interior angles that are not adjacent to it.
Since angle \(x\) is an exterior angle of the yellow triangle, then \(x=50+105=155°\).
The sum of angles that are formed on a straight line is equal to 180°.
Since angles \(x\) and \(y\) form a straight line, then \(x+y=180°\). So, \(y=180°-155°=25°\).
Finally, \(x° - y°=155°-25°=130°\).
Answer: B
In the figure above, if the degree measure of a central angle subtending the red arc is \(100°\) and the degree measure of a central angle subtending the blue arc is \(210°\), then what is the value of \(x° - y°\) ?
A. \(110°\)
B. \(130°\)
C. \(145°\)
D. \(155°\)
E. \(165°\)
We need the following properties to solve this question:
An inscribed angle is exactly half the corresponding central angle.
Since the red arc is \(100°\), then inscribed angle that subtends this arc will be half of that, so \(50°\).
Since the blue arc is \(210°\), then inscribed angle that subtends this arc will be half of that, so \(105°\).
Check the image below:
The measure of an exterior angle of a triangle is equal to the sum of the measures of the two interior angles that are not adjacent to it.
Since angle \(x\) is an exterior angle of the yellow triangle, then \(x=50+105=155°\).
The sum of angles that are formed on a straight line is equal to 180°.
Since angles \(x\) and \(y\) form a straight line, then \(x+y=180°\). So, \(y=180°-155°=25°\).
Finally, \(x° - y°=155°-25°=130°\).
Answer: B
General Discussion
04 Sep 2020, 08:14
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I the figure above, if the
degree measure of inscribed angle subtending the red arc is 100° and the degree measure of an inscribed angle subtending the blue arc is 210°, then what is the value of x° - y° ?
Angle formed on circumference by an arc = Inscibed angle/2
Angle y = 180 - 210/2 - 100/2 = 180 -105-50= 25
x = 180-25=155
x-y=155-25=230
IMO B
Posted from my mobile device
degree measure of inscribed angle subtending the red arc is 100° and the degree measure of an inscribed angle subtending the blue arc is 210°, then what is the value of x° - y° ?
Angle formed on circumference by an arc = Inscibed angle/2
Angle y = 180 - 210/2 - 100/2 = 180 -105-50= 25
x = 180-25=155
x-y=155-25=230
IMO B
Posted from my mobile device
if the degree measure of an inscribed angle subtending the red arc is 100° = angle at center
and the degree measure of an inscribed angle subtending the blue arc is 210 = angle at centre
y+ 105+50= 180
y= 25
180-x+50+105= 180
x= 155
x-y= 130
hence b
and the degree measure of an inscribed angle subtending the blue arc is 210 = angle at centre
y+ 105+50= 180
y= 25
180-x+50+105= 180
x= 155
x-y= 130
hence b
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