# 8th grade Geometry & measures

## Geometry & measures syllabus for 8th grade

Here are some key aspects of the math curriculum for geometry and measures for students aged 13 to 14:

1. Triangles: Students explore properties and theorems related to triangles, including the Triangle Inequality Theorem, the Pythagorean Theorem, and the various types of triangles (scalene, isosceles, equilateral). They apply these concepts to solve problems involving triangle congruence and similarity.

2. Polygons: Students study properties of polygons in more depth. They explore regular polygons, irregular polygons, and convex and concave polygons. They learn about the sum of interior and exterior angles of polygons and apply these concepts to solve problems.

3. Circles: Students learn about the properties of circles, including central angles, inscribed angles, arc lengths, and chords. They explore relationships between angles and arcs in circles and solve problems involving circle geometry.

4. Three-Dimensional Figures: Students study three-dimensional figures such as prisms, pyramids, cylinders, cones, and spheres. They learn to calculate surface area and volume for these shapes, including composite figures. They apply these concepts to solve problems involving real-world scenarios and three-dimensional modeling.

5. Transformations: Students further explore transformations, including translations, reflections, rotations, and dilations. They deepen their understanding of how these transformations affect the position, orientation, and size of geometric figures. They apply transformations to solve problems involving symmetry, congruence, and similarity.

6. Similarity and Congruence: Students deepen their understanding of similarity and congruence. They explore similarity transformations, such as dilation, and use them to establish similarity between figures. They apply congruence criteria to prove congruence between triangles and other shapes.

7. Trigonometry: Students are introduced to basic trigonometric concepts. They learn about sine, cosine, and tangent ratios in right triangles and apply them to solve problems involving angles and side lengths. They explore the applications of trigonometry in real-world situations, such as navigation and measuring heights.

8. Geometric Proofs: Students engage in more formal geometric proof activities. They learn different proof techniques, including direct proofs, indirect proofs, and proofs involving congruent triangles and parallel lines. They apply logical reasoning and deductive arguments to prove geometric theorems.

9. Geometric Constructions: Students further develop their skills in geometric constructions. They learn advanced constructions, such as constructing tangents to circles, dividing lines into equal parts, and constructing regular polygons. They explore the properties and applications of these constructions.

10. Coordinate Geometry: Students deepen their understanding of coordinate geometry. They explore concepts such as the distance formula, midpoint formula, and equations of lines. They use coordinate geometry to investigate geometric relationships and solve problems involving geometric figures on the coordinate plane.

Throughout the curriculum, students engage in problem-solving activities, mathematical modeling, and real-world applications to reinforce their understanding of geometry and measurement. They develop their skills in critical thinking, logical reasoning, spatial visualization, and mathematical communication.

## Geometry & measures topics by sub-category

#### Geometry & measures   →   Circle   →   Properties

Parts of the circle 2

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

#### Geometry & measures   →   Measures of angles   →   Find the angle

Vertically opposite angles

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

#### Geometry & measures   →   Trigonometry   →   SOHCAHTOA

Identify names of sides

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

#### Geometry & measures   →   Quadrilaterals   →   Properties

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

#### Geometry & measures   →   Similar shapes   →   Similar shapes

Identify similar shapes

Identify the pairs of shapes which are similar