Geometry - Shape Classification (2D) - Advanced

35 Topics, 5 Skills

Polygons - Number of Sides to Name

Topic 1

Classifying Polygons by Sides

Topic 2

Classifying Polygons by Sides and Regular or Irregular

Topic 3

Polygons - Name to Number of Sides

Topic 4

Classifying Polygons by Sides - Reversed

Topic 5

Classifying Polygons by Sides

Topic 6

Classifying Polygons as Regular or Irregular

Topic 7

Circles - Rule to Find Diameter from Radius - Simple

Topic 8

Circles - Rule to Find Radius from Diameter - Simple

Topic 9

Circles - Find Diameter from Radius

Topic 10

Circles - Find Diameter from Radius

Topic 11

Circles - Find Radius from Diameter

Topic 12

Shapes - 2D Complex

Topic 13

Shapes Reversed - 2D Complex

Topic 14

Quadrilaterals - Is Shape of a Type

Topic 15

Quadrilaterals

Topic 16

Quadrilaterals Reversed

Topic 17

Acute, Obtuse, Right or Straight - First Time

Topic 18

Acute, Obtuse, Right or Straight

Topic 19

Acute, Obtuse, Right or Straight (Reversed)

Topic 20

90, 180, or 270 Degrees

Topic 21

Triangle Classification - Both

Topic 22

Triangle Classification - Angles - First Time

Topic 23

Triangle Classification - Angles - Image to Description

Topic 24

Triangle Classification - Angles - Description to Name

Topic 25

Triangle Classification - Angles - Name to Description

Topic 26

Triangle Classification - Angles - Reversed

Topic 27

Triangle Classification - Angles

Topic 28

Triangle Classification - Both - First Time

Topic 29

Triangle Classification - Sides - First Time

Topic 30

Triangle Classification - Sides - Image to Description

Topic 31

Triangle Classification - Sides - Description to Name

Topic 32

Triangle Classification - Sides - Name to Description

Topic 33

Triangle Classification - Sides - Reversed

Topic 34

Triangle Classification - Sides

Topic 35

Circles - Find Diameter from Radius (Level 2)

Topic 11

This math topic focuses on the skill of calculating the diameter of a circle from a given radius. It involves applying the basic geometric formula where the diameter is twice the radius (D = 2r). This forms part of a broader study on 2D shape classification within geometry. This practice includes multiple problems that provide a radius, and students are required to find the correct diameter, enhancing their understanding of circle properties and calculations related to circle measurements.

Work on practice problems directly here, or download the printable pdf worksheet to practice offline.

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Circles - Find Diameter from Radius

Complete these online problems with 80% or 4 correct answers in a row. Results are immediate.


Find the diameter of the circle that has the given radius

r=5d=?