Illustrative Mathematics - Geometry - Mathematics - Unit 2 - Lesson 14 - Formative Library | Library

Select all quadrilaterals for which a diagonal is also a line of symmetry.

G.CO.3

G.CO.12

G.CO.9

Show that diagonal EG is a line of symmetry for rhombus EFGH.

G.CO.3

G.CO.12

G.CO.9

ABDE is an isosceles trapezoid. Priya makes a claim that triangle AEB is congruent to triangle DBE. 
Convince Priya this is not true.

G.CO.3

G.CO.12

G.CO.9

In quadrilateral ABCD, triangle ADC is congruent to CBA. 
Show that ABCD is a parallelogram.

G.CO.3

G.CO.12

G.CO.9

10.

11.

12.

13.

14.

Is triangle AFE congruent to triangle ADE?

Explain your reasoning.

G.CO.3

G.CO.12

G.CO.9

15.

Triangle DAC is isosceles with congruent sides AD and AC. Which additional given information is sufficient for showing that triangle DBC is isosceles? 
Select all that apply.

Segment AB is congruent to segment BD.

Triangle BDA is congruent to triangle BDC.

AB is an angle bisector of DAC.

Segment DB is congruent to segment BC.

Angle ADC is congruent to angle ACD.

Angle ABD is congruent to angle ABC.

G.CO.3

G.CO.12

G.CO.9

This lesson is from Illustrative Mathematics. Geometry, Unit 2, Lesson 14. Internet. Available from https://curriculum.illustrativemathematics.org/HS/teachers/2/2/14/index.html ; accessed 29/July/2021.

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