Question the-me

4.3 Circles - Arc length and sector area
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The measure of angle R is 2 π 3 radians. The measure of angle T is 5 π 12 radians greater than the measure of angle R . What is the measure of angle T , in degrees?

A.

75

B.

120

C.

195

D.

390

The measure of angle R is 2 π 3 radians. The measure of angle T is

Medium-difficulty · SAT Math · Circles — Arc length and sector area. Read the question above, select your answer, and check the full explanation below to understand exactly why the correct choice works.

Answer explanation

Choice C is correct. It’s given that the measure of angle R is 23 radians, and the measure of angle T is 512 radians greater than the measure of angle R . Therefore, the measure of angle T is equal to 23+512 radians. Multiplying 23 by 44 to get a common denominator with 512 yields 812. Therefore, 23+512 is equivalent to 812+512, or 1312. Therefore, the measure of angle T is 1312 radians. The measure of angle T , in degrees, can be found by multiplying its measure, in radians, by 180. This yields 1312/mo>180, which is equivalent to 195 degrees. Therefore, the measure of angle T is 195 degrees.

Choice A is incorrect. This is the number of degrees that the measure of angle T is greater than the measure of angle R .

Choice B is incorrect. This is the measure of angle R , in degrees.

Choice D is incorrect and may result from conceptual or calculation errors.