Exploring Circles and CPCTC Concepts

What is the formula for the area of a circle?

• pi times the radius squared

• diameter times pi

• pi times the diameter squared

• 2 times the radius times pi

Which formula can be used to calculate the circumference of a circle?

• pi times the radius squared

• 2 times the radius times pi

• radius times pi

• diameter squared times pi

How do we label a circle?

• By the radius

• By the center point

• By any point on the circle

• By the diameter

What is the theorem about the radii of a circle?

• All radii of a circle are different

• All radii of a circle are perpendicular

• All radii of a circle are parallel

• All radii of a circle are equal

What should you look for in a diagram when given a circle?

• The diameter

• The area

• The circumference

• The radii

What is the reason for stating that AB is congruent to BC in a circle?

• All tangents of a circle are congruent

• All diameters of a circle are congruent

• All chords of a circle are congruent

• All radii of a circle are congruent

What does CPCTC stand for?

• Congruent parts of corresponding triangles are equal

• Corresponding parts of congruent triangles are congruent

• Congruent parts of corresponding triangles are congruent

• Corresponding parts of congruent triangles are equal

How many corresponding sides and angles are there in congruent triangles?

• 4 sides and 4 angles

• 3 sides and 3 angles

• 5 sides and 5 angles

• 2 sides and 2 angles

When can CPCTC be used in a proof?

• After proving triangles congruent

• Without proving triangles congruent

• Before proving triangles congruent

• Only for proving angles congruent

What should never be seen in the statements column of a proof?

• The given information

• The conclusion

• CPCTC

• The diagram