Circle Parts

Which of the following is true about a tangent and a radius at the point of contact?

• They intersect at a 45-degree angle.

• They are parallel to each other.

• They intersect at a 90-degree angle.

• There is no specific angle at which they intersect.

Which of the following statements is true about the radius and diameter of a circle?

• The diameter is twice the length of the radius.

• The radius is twice the length of the diameter.

• The diameter and radius are always equal.

• The radius is half the length of the diameter.

Tags

CCSS.HSG.C.A.2

If a line touches a circle at exactly one point, what is this line called?

• Chord

• Secant

• Tangent

• Diameter

If the diameter of a circle is 10 cm, what is the radius?

• 20 cm

• 5 cm

• 10 cm

• 2.5 cm

Tags

CCSS.7.G.B.4

If the radius of a circle is 8 inches, what is the diameter?

• 4 inches

• 8 inches

• 16 inches

• 32 inches

Tags

CCSS.7.G.B.4

If a circle has a radius of 7 cm, what is the length of the diameter?

• 3.5 cm

• 7 cm

• 14 cm

• 28 cm

Tags

CCSS.7.G.B.4

Which of the following best describes how to identify a tangent line to a circle on a coordinate plane?

• It is a line that crosses the circle at two points.

• It is a line that touches the circle at exactly one point and is perpendicular to the radius at that point.

• It is any line that passes through the center of the circle.

• It is a line that makes a 45-degree angle with a diameter of the circle.

Click on the Center of the circle

Tangent lines intersect a circle exactly (a)   at a ​ (b)   The ​ (c)   of the circle is directly in the middle of the circle and is where the​ (d)   starts from.

• Once

• 90 degree angle.

• center

• Radius

Which of the following is NOT a correct property of a tangent to a circle?

• It intersects the circle at exactly one point.

• It is perpendicular to the radius at the point of contact.

• It can never cross the circle.

• It is always parallel to the diameter.