Introduction to Lines & Angles Flashcards

All 7 cards in this deck

What is the mathematical name for an angle smaller than 90°90°?

Acute.

What is the mathematical name for an angle greater than 90°90° but less than 180°180°?

Obtuse.

What is the mathematical name for an angle greater than 180°180° but less than 360°360°?

Reflex.

On a diagram, how are a right angle, a pair of parallel lines and a pair of equal sides each marked?

Right angle: a small square in the corner.
Parallel lines: matching arrowheads.
Equal sides: matching dashes.

In triangle ABCABC, which angle is meant by 'angle ABCABC'?

The angle at vertex BB, between sides BABA and BCBC.

What are the mathematical names of polygons with 5, 6, 7 and 8 sides?

Pentagon (5), hexagon (6), heptagon (7), octagon (8).

True or false? Lines marked with matching arrowheads on a diagram are perpendicular.

False. Matching arrowheads mean the lines are parallel; perpendicular lines are shown with a small square.