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inessss [21]
3 years ago
10

Angle sum Theory

Mathematics
1 answer:
maria [59]3 years ago
3 0

Step-by-step explanation:

step 1. so ABC is a triangle.

step 2. interior angles of a triangle add up to 180°

step 3. <A + <B + <C = 180°

step 4. 54 + <B + 74 = 180°

step 5. <B = 52°.

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