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# If the measure of the angle ADO is 50°, and the radius is 9 what is th

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Math Expert
Joined: 02 Sep 2009
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If the measure of the angle ADO is 50°, and the radius is 9 what is th  [#permalink]

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11 Sep 2018, 02:52
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100% (01:57) correct 0% (00:00) wrong based on 8 sessions

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If the measure of the angle ADO is 50°, and the radius is 9 what is the length of the arc ACB?

A. 2π

B. 3π

C. 5π

D. 6π

E. 8π

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image008 (2).jpg [ 2.42 KiB | Viewed 316 times ]

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Re: If the measure of the angle ADO is 50°, and the radius is 9 what is th  [#permalink]

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11 Sep 2018, 03:01

Also Angle BAD = 90. Since angle in a semi circle is 90.

Then angle ABD = 40.

Hence angle BAO = 40.
Angle BOA = 180-40-40 = 100.

Lenght of Arc ACB = 2Pir*Theta/360= 18Pi*100/360 = 5Pi

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Re: If the measure of the angle ADO is 50°, and the radius is 9 what is th   [#permalink] 11 Sep 2018, 03:01
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