Help plzzz i have till 2 plzzz

Yes, because 1 & 2 have to be the same

Step-by-step explanation:

Yes

Step-by-step 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.

70

step-by-step explanation:

2*5=10

4*15=60

60+10=

70

we would need a picture of the quadrilateral in order to answer the question. also, it seems that the question is missing some components.