Illustrative Mathematics - Geometry - Mathematics - Unit 1 - Lesson 5

This diagram is a straightedge and compass construction of a line perpendicular to line AB passing through point C. Explain why it was helpful to construct points D and A to be the same distance from C.

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G.CO.1

G.CO.12

G.CO.9

This diagram is a straightedge and compass construction. Select all true statements.

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G.CO.1

G.CO.12

G.CO.9

This diagram is a straightedge and compass construction. A is the center of one circle, and B is the center of the other. A rhombus is a quadrilateral with 4 congruent sides. Explain why quadrilateral ACBD is a rhombus.

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G.CO.1

G.CO.12

G.CO.9

In the construction, A is the center of one circle, and B is the center of the other. Explain why segment EA is the same length as segment BC.

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G.CO.1

G.CO.12

G.CO.9

A sheet of paper with points A and B is folded so that A and B match up with each other. Explain why the crease in the sheet of paper is the perpendicular bisector of segment AB. (Assume the conjecture that the set of points equidistant from A and B is the perpendicular bisector of segment AB is true.)

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G.CO.1

G.CO.12

G.CO.9

Here is a diagram of a straightedge and compass construction. C is the center of one circle, and B is the center of the other. Explain why the length of segment CB is the same as the length of segment CD.

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G.CO.1

G.CO.12

G.CO.9