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CONVEX POLYGON If all of the diagonals lie in the interior of the figure, then the polygon is convex.
THEOREM 10-1 If a convex polygon has n sides, then the sum of the measures of its interior angles is
(n-2)180
THEOREM 10-2 In any convex polygon, the sum of the measures of the exterior angles, one at each vertex, is 360.
POSTULATE 10-1For any polygon and a given unit of measure, there is a unique number A called the measure of the area of the polygon
POSTULATE 10-3The area of a given polygon equals the sum of the areas of the nonoverlapping polygons that form the given polygon.
THEOREM 10-3 If a triangle has an area of A square units, a base of b units, and a corresponding altitude of h units, then
A = ½ bh
THEOREM 10-4 If a trapezoid has an area of A square units, bases of b1 and b2 units, and an altitude of h units, then
A = ½ h(b1 +b2)
APOTHEMA segment that is drawn from the center that is perpendicular to a side of the regular polygon
THEOREM 10-5 If a regular polygon has an area of A square units, and apothem of a units, and a perimeter of P units, then
A = ½ aP
SIGNIFICANT DIGITS All digits that are not zeros and any zero that is between two significant digits
Significant digits represent the precision of a measurement
SYMMETRY If you can draw a line down the middle of a figure and each half is a mirror image of the other, it has symmetry
LINE SYMMETRY If you can draw this line, the figure is said to have line symmetry
The line itself is called the line of symmetry
ROTATIONAL SYMMETRY
If a figure can be turned or rotated less than 360° about a fixed point so that the figure looks exactly as it does in its original position, it has rotational or turn symmetry