Warm Up Which of these quadrilaterals would fit the definition of a parallelogram? Rhombus Trapezoid Rectangle Kite All these quadrilaterals have 2 pairs of congruent sides except… Parallelogram

Circles Section 1.7

Basic Understanding Center – The point in the center of the circle Radius – The distance from the center of the circle to any point on the circle

Defining Circle Terms Investigation – page 70 Define the three terms Chord – A line segment whose endpoints lie on the circle Diameter – A chord that passes through the center of the circle Tangent – A line that intersects the circle only once

More Definitions Congruent Circles – Two or more circles that are congruent Concentric Circles – Two or more coplanar circles share the same center Arc – A portion of the circumference of a circle. Arcs have 2 endpoints

Arcs Semicircle – An arc whose endpoints are the endpoints of the diameter Minor Arc – An arc smaller than a semicircle Major Arc – An arc larger than a semicircle

Measure Arc measure of a full circle is 360 degrees, a semicircles arc measure is 180 degrees, and so on. Arc Measure – Same as the measure of the central angle Central Angle – An angle with its vertex at the center of a circle

Notation How to show arc measure, notation, and identify between minor and major arcs

Homework Pg 72 #1-15 (skip 12), 19-37 (odd) Homework check soon. Be ready!