Unit 5 Flashcard 1: Lessons 1-3

Front

What is a convex polygon?

Back

A convex polygon is a polygon where all interior angles are less than 180 degrees, and no line segment between any two points on the boundary ever goes outside the polygon.

Front

What is the value of x if x + 3 = 10?

Back

x = 7

Front

What is the value of y if 2y = 220?

Back

y = 110

Front

In trapezoid ADCB, if AD is parallel to BC and the lengths of AD and BC are given, how do you find the value of x?

Back

Use the properties of trapezoids and the relationships between the angles and sides.

Front

How many sides does a heptagon have?

Back

A heptagon has 7 sides.

Front

What is the formula for the sum of interior angles of a polygon?

Back

The sum of the interior angles of a polygon with n sides is (n-2) × 180 degrees.

Front

What is the difference between a regular and irregular polygon?

Back

A regular polygon has all sides and angles equal, while an irregular polygon does not.

Front

What is the definition of a trapezoid?

Back

A trapezoid is a four-sided figure (quadrilateral) with at least one pair of parallel sides.

Front

If a polygon has 8 sides, what is it called?

Back

An octagon.

Front

What is the relationship between the exterior angle and interior angle of a polygon?

Back

The exterior angle is equal to 180 degrees minus the interior angle.