Question

The sides BA and DC of a quadrilateral ABCD are produced as shown in the figure. Let ∠D=70° and ∠B=70°, then find a+b.

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Answer 1

Answer:

total angle sum of rhombhus 360°

Let a be x

so 2x + 140 = 360

2x = 360 - 140

2x = 220

x = 220 / 2

x = 110°

so 110 + 70 = 180°

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Answer 2

Answer: hi ☺

hope my answer helps you

Step-by-step explanation:

quadrilateral ABCD,  

∠A=180−b

and ∠C=180−a

The Sum of all the angles of a quadrilateral is:

∠A+∠B+∠C+∠D=360  

o

 

⇒180−b+x+180−a+y=360

⇒360−a−b+x+y=360

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