Question

17 The circle in the figure below has center 0, which of the following measures for the figure would be afficient by itself to determine the radius of the circle? I. The length of arc PQRII. The perimeter of triangle OPRIII. The length of chord PRA. NoneB. I onlyC. II onlyD. I and III

Answer 1

For determine the radius of circle

The triangle OPR where OP and PR the redius of circle so use Pythagorean theorem so

$PR^2=OP^2+OR^2$

Where OP and OR is same because both are redius .

then required the length of PR

and if PQR known then with the help of and angle is 90 then find the redius of circle .

so answer is D | and |||