ข้อสอบท้ายบท วงกลม ม.3

Given point O is the center,  $\angle BAC=30\degree$   and  $\angle ACO=15\degree$  . Find  $\angle ABO.$  

•  $15\degree$  

•  $20\degree$  

•  $22\degree$  

•  $24\degree$  

• None of these

Given point O is the center. $\angle OBC=45\degree$  ,find  $\angle BAC.$  

•  $40\degree$  

•  $45\degree$  

•  $50\degree$  

•  $55\degree$  

• None of these

Find the value of 2x .

• $90\degree$

• $95\degree$

• $180\degree$

• $190\degree$

• None of these

Given $\angle a\ +\angle b=240\degree.$  ,find  $\angle CAD.$  

•  $60\degree$  

•  $65\degree$  

•  $70\degree$  

•  $75\degree$  

• None of these

Given point O is the center,  $\overline{BD}$  is the diameter, $\angle ADC=115\degree$  , $\angle ACD=25\degree$   , find  $\angle BAC$   .

•  $35\degree$  

•  $40\degree$  

•  $45\degree$  

•  $50\degree$  

• None of these

In figure, find  $\angle TDE$  .

 

•  $90\degree$   

•  $95\degree$  

•  $97\degree$  

•  $99\degree$  

• None of these

In figure ABC , CD is a tangent. DE is a diameter.  $\angle ABE=30\degree$  , find  $\angle ACD$  .

•  $30\degree$  

•  $40\degree$  

•  $50\degree$  

•  $60\degree$  

• None of these

Given AB = BD.  $\angle APQ=98\degree$  , $\angle PCB=150\degree$  

Find $\angle PQB$  .

•  $20\degree$  

•  $21\degree$  

•  $22\degree$  

•  $23\degree$  

• None of these

CD = 8 cm and OQ = 3 cm , find the length of AB.

• 10 cm

• 12 cm

• 13 cm

• 15 cm

• None of these

The radius of circle X is 8 cm. The radius of circle Y is 3 cm. XY = 13 cm , find the length of AB.

• 10 cm

• 12 cm

• 12.5 cm

• 12.8 cm

• None of these