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22 votes
22 votes
Helpppp plzzz i have till 2 plzzz

Helpppp plzzz i have till 2 plzzz-example-1
User Michael Eilers Smith
by
3.0k points

2 Answers

20 votes
20 votes

Answer:

Yes

Explanation:

Supplementary means 180 degree.

∠1 + ∠3 = 180 ----> eq. 1

∠2 and ∠3 are linear pair angles which are also supplementary.

∠2 + ∠3 = 180 ----> eq. 2

∠3 = 180 - ∠1 ----> eq. 3

( from eq. 1 )

∠3 = 180 - ∠2 ----> eq. 4

( from eq. 2 )

From, eq. 3 and eq. 4,

180 - ∠1 = 180 - ∠2

Subtract 180 on both sides.

180 - 180 - ∠1 = 180 - 180 - ∠2

- ∠1 = - ∠2

Multiply - 1 on both sides,

∠1 = ∠2

Since,

∠1 = ∠2

Sides opposite to them also equal

So, AC = BC

If any two sides in a triangle is equal, then the triangle is an isosceles triangle.

Therefore,

Δ ABC is isosceles.

User Gean Ribeiro
by
2.6k points
11 votes
11 votes

Answer:

Yes, because 1 & 2 have to be the same

Explanation:

User Shivam Bhalla
by
2.7k points