Circle

Question 1

Circumference

Answer 1

2ñr

Question 2

Circle Theorem 1

Angles at the Center

Answer 2

Twice the angle at the circumference standing on the same arc.

Question 3

Circle Theorem 2

Angles in the same Segment

Answer 3

Are equal

Question 4

Circle Theorem 3

Angles in a SemiCircle

Answer 4

The angle subtended at the circumference by a diameter is a right angle.

Question 5

Circle Theorem 4

Cyclic Quadrilateral

Answer 5

Opposite angles are supplementary

Question 6

Circle Theorem 5

Exterior angle of a cyclic quadrilateral

Answer 6

Equal to the interior opposite angle

Question 7

Circle Theorem 6

Angle between a Tangent and Radius

Answer 7

Is 90°

Question 8

Circle Theorem 7

Angle between a Tangent and a Chord

Answer 8

Is equal to the angle in the alternate segment

Question 9

Circle Theorem 8

Center of a circle and Midpoint of a Chord

Answer 9

Is perpendicular

Question 10

Circle Theorem 9

Length of two Tangents from an external point to the point of contact on the circle

Answer 10

are equal.

Question 11

Area

Answer 11

ñr^2

Question 12

Arc length

Answer 12

°/360*2ñr

Question 13

Area of sector

Answer 13

°/360*ñr^2