Math 1 March 15 th WARM-UP: QUIZ TODAY!! In a triangle… 1.The three altitudes intersect at the ____________. 2.The three angle bisectors intersect at the.

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Presentation transcript:

Math 1 March 15 th WARM-UP: QUIZ TODAY!! In a triangle… 1.The three altitudes intersect at the ____________. 2.The three angle bisectors intersect at the __________. 3.The three medians intersect at the ____________. 4.The three perpendicular bisectors intersect at the ____. 5.S is the centroid in the triangle below. SV = 4, UW = 5, and QW = 21 Find the measure of: a) ST b) TW c) QS

Announcement for Freshman: You must pass your MATH class and your ENGLISH class to be promoted to 10 th grade. So, if you fail MATH OR ENGLISH, you will stay in 9 th grade next year.

More Important Terms EQUILATERAL - All sides are congruent EQUIANGULAR - All angles are congruent REGULAR - All sides and angles are congruent

Polygons are named by listing its vertices consecutively. AB ED C F

Polygons can be CONCAVE or CONVEX CONVEX CONCAVE

Ex. 3 Classify each polygon as convex or concave.

What is the sum of the measures of the interior angles of a triangle? 180° What is the sum of the measures of the interior angles of any quadrilateral?REVIEW: 180° 360°

# of sides # of triangles Sum of measures of interior angles 31 1(180) = (180) = (180) = (180) = 720 n n-2 (n-2)  180

If a convex polygon has n sides, then the sum of the measure of the interior angles is (n – 2)(180°)

Ex. 1 Use the regular pentagon to answer the questions. A)Find the sum of the measures of the interior angles. B)Find the measure of ONE interior angle 540° 108°

Two more important terms Exterior Angles Interior Angles

If any convex polygon, the sum of the measures of the exterior angles, one at each vertex, is 360°

1 3 2

Ex. 2 Find the measure of ONE exterior angle of a regular hexagon. 60°

Ex. 3 Find the measure of ONE exterior angle of a regular heptagon. 51.4°

Ex. 4 Each exterior angle of a polygon is 18 . How many sides does it have? n = 20

Ex. 5 The sum of the measures of five interior angles of a hexagon is 535. What is the measure of the sixth angle? 185°

Ex. 6 The measure of the exterior angle of a quadrilateral are x, 3x, 5x, and 3x. Find the measure of each angle. 30°, 90°, 150°, and 90°

Ex. 7 If each interior angle of a regular polygon is 150 , then how many sides does the polygon have? n = 12

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