Free Math Games has the following sub-categories and topics for 8th grade Geometry & measures. You can study any of the topics with our 3 tutorial activities by following the 'Lessons' link. If you are familiar with the subject, try some of our 10 free games to practice the topic by following the 'Games' links, or test yourself with our multiple choice and written tests using the 'Tests' link.

Parts of the circle 2

Identify parts of the circle: arc, chord, sector, segment and tangent

Circumference of circles

Using the formula C = 2πr calculate the circumference of circles to 2 decimal places

Circumference of semicircles

Use C = πr + 2r to calculate the circumference of the given semicircles to 2 decimal places

Area of compound shapes

Calculate the areas of the given compound shapes constructed from parallelograms to 2 d.p.

Area of circles

Using the formula A = πr² calculate the area of the given circles to 2 decimal places

Calculate surface area of cubes

Use multiplication or the formula SA = 6H² to calculate the surface area of cubes

Calculate surface area of cuboids

Use pairs of sides to calculate the total surface area of cuboids using the formula SA =2(LW+LH+HW)

Surface area of triangular prisms

Using a net or otherwise calculate the total surface area of triangular prisms to 2 d.p.

Calculate volume of cubes

Use the standard formula L³ (length cubed) to calculate the volume of cubes

Volume of prisms

Use the standard formula (area of cross section times length) to calculate the volume of prisms to 2 d.p.

Calculate the volume of cylinders

Use the standard formula (area of cross section times length) to calculate the volume of cylinders to 2 d.p.

Describe the bearing

In each instance identify if the type of bearing is acute, obtuse or reflex

Estimate the bearing

Choose the most appropriate three figure bearing from the given options

Angles around parallel lines

Use parallel line rules to find alternate, corresponding and allied angles

Parallel lines and shapes

Use parallel line rules to find the missing angle in each of the given shapes

Vertically opposite angles

In each instance use vertically opposite angles to find the missing angle

Identify congruent, similar triangles

Identify triangles which are congruent, similar or neither

Labels for sides, angles

Identify the standard conventions for labeling the angles and sides of different types of triangles

Calculate the hypotenuse

Use Pythagoras' theorem to calculate the hypotenuse for these right-angle triangles to 2 decimal places

Find the missing length

Use Pythagoras' theorem to calculate the length of a side that is not the hypotenuse to 2 decimal places

Identify names of sides

Identify whether the marked sides of right angle triangles are the hypotenuse, adjacent or opposite

Rotational symmetry: quadrilaterals

Identify the order of rotational symmetry for each of the given quadrilaterals

Identify polygons from properties

Use the given properties to identify the polygon

Lines of symmetry: polygons

Identify the number of lines of symmetry possessed by each of the given polygons

Rotational symmetry: polygons

Identify the order of rotational symmetry for each of the given polygons

Exterior angles of regular polygons

Use the number of sides to calculate the exterior angles for each of the given regular polygons

Number of sides from exterior angle

Use the exterior angle to calculate the number of sides for each of the given regular polygons

Interior angle from exterior angle

Use the exterior angle for each regular polygon to calculate the interior angle

Sum of interior angles

Calculate the sum of the interior angles for each of the given polygons

Column vectors

Identify the correct shape on the graph for the given column vector

Describe translations

In each instance identify the correct column vector for the given translation

Identify reflections

Identify the correct shape for the described reflection

Describe reflections

Identify the line of symmetry (also called the mirror line) for each of the reflections

Describe rotation

In each instance identify the correct description for the given rotation

Rotation

Identify the correct shape on the grid for the described rotation

Positive integer scale factors

Identify the correct shape on the graph for the given positive integer scale factor enlargement

Negative scale factors

Identify the correct shape on the graph for the given negative scale factor enlargement

Identify similar shapes

Identify the pairs of shapes which are similar

Triangles: scale factors

In each instance find the scale factor between the two similar triangles

Triangles: length from scale factors

Use scale factor ratios to work out lengths on the smaller or larger of the given triangles

Other shapes: length from scale factor

Find and use the scale factor to work out lengths on similar shapes that are not triangles

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