i c circles everywhere

Front

If ∠ CEF = 35 degrees, what is the measure of arc CF?

Back

35 degrees

Front

If DE = 24, what is the length of BD?

Back

12

Front

What do a tangent and a radius create?

Back

⊥ lines (perpendicular lines)

Front

If BF = 14, what is the length of AB?

Back

14

Front

What is the measure of a semi circle?

Back

180 degrees

Front

What is the relationship between the angle at the center of a circle and the arc it subtends?

Back

The angle at the center is twice the angle at the circumference subtended by the same arc.

Front

What is the formula for the circumference of a circle?

Back

C = 2πr, where r is the radius.

Front

What is the area of a circle?

Back

A = πr², where r is the radius.

Front

What is the definition of a tangent to a circle?

Back

A line that touches the circle at exactly one point.

Front

What is the relationship between the radius and the tangent at the point of contact?

Back

The radius is perpendicular to the tangent at the point of contact.