An Example on - -
News
Advanced Search
LOGIN
SIGN UP
Home
Math
Dictionary
Physics
Dictionary
Biology
Dictionary
Homework
Help
Elementary
Math
Middle School
Math
High School
Math
Solved
Examples
Mathematics
Formulae
Feedback
Assessment
Test
This site is best viewed with Mozilla Firefox.
Please install Math Player to see the Math Symbols properly
Solved Examples
<<Back to List>>
Next>>
Attempt following question by selecting a choice to answer.
c
∠
ABC =
∠
ACB = 60° in ΔABC
. Find the exterior angles
x
and
y
.
DD cc
A.
c
60° and 120°
B.
c
120° and 120°
C.
c
130° and 120°
D.
c
None of the above
c
B
View Solution Steps
Step 1: The sum of the interior angle and the exterior angle is 180°.
Step 2: Hence,
∠
y
+
∠
ABC = 180°.
Step 3:
∠
y
+ 60° = 180°[Substitute
∠
ABC = 60°.]
Step 4:
∠
y
= 180° - 60° = 120° [Subtract 60° on both sides.]
Step 5: The exterior angle at B = 120°.
Step 6:
∠
x
+
∠
ACB = 180°.
Step 7:
∠
x
+ 60° = 180°[Substitute
∠
ACB = 60°.]
Step 8:
∠
x
= 180° - 60° = 120°[Subtract 60° on both sides.]
Step 9: The exterior angle at C = 120°.
Request for Email
* Please give a valid email id.
* Log into the site atleast once.
Enter your Mail Id:
We have a back-to-school special for all registering before October 15th. You get 1 year free access to iCoachMath.
Send us an email at
support-icm@icoachmath.com
with details of your school include the Name and City.
Web Toolbar by Wibiya