Introduction to Lines & Angles Flashcards
All 7 cards in this deck
What is the mathematical name for an angle smaller than ?
Acute.
What is the mathematical name for an angle greater than but less than ?
Obtuse.
What is the mathematical name for an angle greater than but less than ?
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 , which angle is meant by 'angle '?
The angle at vertex , between sides and .
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.