Question

what is the value of cos a from the given triangle ABC
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Answer 1

Step-by-step explanation:

let angle a and angle c be x

According to question

angle a + angle b + angle c = 180

x + 90 + x = 180

2x + 90 = 180

2x = 180 - 90

2x = 90

x = 90/2

x = 45

angle a, c = 45°

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