The area of an 11-cm-wide rectangle is 242cm2. What is it's length
1 answer:
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Answer:
Step-by-step explanation:
Given:
m ∠BDC = 20
m arc AB = 140
m arc CD = 120
Now, let the center of the circle be at point 'O'.
From the triangle AOB,
OA = OB (Radius of the circle)
∴ m∠ABO = m∠BAO = m ∠1
∵ m arc AB = 140
∴ m ∠AOB = 140 (Arc measure equals the angle subtended by the arc at the center)
Now, sum of all angles of a triangle is equal to 180. So,
Therefore, the measure of angle 1 is 20. So, the last option is correct.
