Day 17 CircleS & PolygonS

Match the vocabulary word to the definition. right triangle a triangle in which one angle is 90 degrees acute triangle a triangle with all angles less than 90 degrees obtuse triangle a triangle with one angle greater than 90 degrees scalene triangle none of the sides on a triangle are equal length equilateral triangle all the sides on the triangle are equal isosceles triangle two sides on the triangle are equal in length Name the triangle by its side lengths. right triangle left triangle scalene triangle isosceles triangle Name the triangle by its angles. obtuse triangle right triangle left triangle acute triangle Match the polygon to the correct number of sides. triangle 3 sides decagon 10 sides quadrilateral 4 sides hexagon 6 sides pentagon 5 sides octagon 8 sides What is the name of this polygon? heptagon hexagon octagon nonagon What is the name of this polygon? pentagon quadrilateral square hexagon TRUE or FALSEA regular pentagon has equal side lengths. true false TRUE or FALSEAn irregular polygon has equal side lengths. true false TRUE or FALSEA circle is a polygon. true false What is the distance around a circle called? circle circumference radius diameter What is the name of this line called on the circle? diameter chord radius circumference What is this line on the circle called? radius across diameter chord If the diameter of the circle is 10 centimeters, what is the radius? 5 cm 8 cm 10 cm 1 cm If the radius of a circle is 4 cm, what is the diameter? 2 cm 8 cm 4 cm 1 cm