equilateral triangle abd and ace have been drawn on the sides ab and ac respectively of triangle abc, as shown in the figure. I prove that angle dac is equal to eab and dc equal to be
Answers
Answered by
2
Hey Mate,
Here Is Your Answer
____________
Consider the two triangles ACD and ABE,
AD= AB
AC=AE
Included angles :- DAC=60+A= BAE.
So triangles are congruent.
The third sides are equal,
DC=BE.
Answered by
1
Step-by-step explanation:
Hey Mate Here is your Answer
We know:
S
n
=
2
n
[T
1
+T
n
]
∴S
n
=(1+T
n
)(n+2)
⇒
2
n
[T
1
+T
n
]=(1+T
n
)(n+2)
⇒nT
1
+nT
n
=2n+2nT
n
+4+4T
n
⇒2n+nT
n
+4+4T
n
−nT
1
=0
⇒2n+(n+4)T
n
+4−nT
1
=0
∴T
n
=
n+4
nT
1
−4−2n
........(1)
Putting n=1
∴T
1
=
5
T
1
−6
∴T
1
=−
2
3
........(2)
Putting n=2 in eq(1)
∴T
2
=
6
2T
1
−8
=
6
−3−8
=−
6
11
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