Respuesta :

greenforestaz

Step-by-step explanation:

step 1. <B is a central angle of the circle

step 2. <D is an inscribed angle of the circle

step 3. when a central angle and inscribed angle have common endpoints the central angle is twice the inscribed angle

step 4. <B = 2*<D

step 5. <B = 2*31 = 62°