Grade 10 · Geometry
Parallel lines, triangles, and vertical angles. Written in American English for students, parents, and teachers in the United States.
Open a card to see the answer. These are original practice items for US elementary students — not a state test copy.
Answer: congruent
They are opposite when two lines cross.
Answer: 180°
A line is a straight angle.
Answer: 180°
A quadrilateral sums to 360°.
Answer: congruent
They sit inside the parallels on opposite sides of the transversal.
Answer: 90°
Perpendicular lines form right angles.
Answer: 90°
Supplementary angles add to 180°.
Answer: at least two congruent sides
Base angles are congruent.
Answer: prove two triangles congruent
Corresponding parts of congruent triangles are congruent.
Pick the next article in this topic — that is how a magazine issue is meant to be used.
