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Multiple choice question. with explanation
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Multiple choice question. with explanation

Multiple choice question. with explanation-example-1
User Wrren
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1 Answer

6 votes

Answer:

(1)

Explanation:

the sum of the 3 angles in a triangle = 180° .

consider the inner triangle where

a + b + 58° = 180° ( subtract 58° from both sides )

a + b = 122°

consider the outer triangle where

c + d + 63° = 180° ( subtract 63° from both sides )

c + d = 117°

Then

a + b + c + d = 122° + 117° = 239°

User Samazi
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