4/1 Uni 9 Circle Vocab True or False HW Sheet

Use the diagram in your packet.

• True
• False

Answer explanation

AO, CO and DO are all radii of the circle, so they'll all have the same length.

Tags

CCSS.HSG.C.A.2

Use the diagram in your packet.

• True
• False

Answer explanation

Line CD is not a chord because it goes through the circle. It doesn't have endpoints that are on the circle. The symbol used in the question also indicated that you were referring to CD as a line instead of a segment.

Use the diagram in the packet.

• True
• False

Answer explanation

O is not a point ON the circle, it's the center of the circle.

Tags

CCSS.4.G.A.1

Use the diagram in the packet.

• True
• False

Answer explanation

Point B is outside (exterior) of the circle.

Use the diagram in packet.

• True
• False

Answer explanation

Point A is a point of tangency. The center of the circle is Point O, so the circle would be named Circle O.

Tags

CCSS.HSG.CO.A.1

Use the diagram in packet.

• True
• False

Tags

CCSS.2.G.A.1

Use the diagram in packet.

• True
• False

Use the diagram in packet.

• True
• False

Answer explanation

AD is twice the length of OC. OC is one of the radii in Circle O and AD is the diameter. The diameter of a circle is always twice the length of its radii.

Tags

CCSS.HSG.CO.C.10

Use the diagram in packet.

• True
• False

Answer explanation

A chord is always in the interior of a circle because both of its endpoints on the circle. If the chord is fully inside the circle, its midpoint must be too.

Use the diagram in packet.

• True
• False

Answer explanation

A secant touches the circle twice. A tangent line touches the circle only once. So line AB must be a tangent line.