Polygons — الرياضيات الصف الأول الإعدادي لغات

درس «Polygons» فى مادة الرياضيات لـالصف الأول الإعدادي لغات من وحدة «Geometry & Measurement». This lesson introduces polygons as closed plane shapes with at least three sides. It differentiates between convex and concave polygons. The core part of the lesson is deducing the formula for the sum of the interior angles of a polygon by dividing it into triangles. It also defines regular polygons (all sides and angles equal) and shows how to calculate the measure of each interior angle. Finally, it explores the concept of axes of symmetry in regular polygons. هتتعلم فى الدرس ده: A polygon is a closed shape made of line segments. It can be convex (all angles < 180°) or concave (at least one...

الدرس ده من وحدة «Geometry & Measurement» فى مادة الرياضيات لـالصف الأول الإعدادي لغات على منصة دروسات.

الدرس متاح بالاشتراك: ترم كامل أو المادة لوحدها.

ملخص الدرس

This lesson introduces polygons as closed plane shapes with at least three sides. It differentiates between convex and concave polygons. The core part of the lesson is deducing the formula for the sum of the interior angles of a polygon by dividing it into triangles. It also defines regular polygons (all sides and angles equal) and shows how to calculate the measure of each interior angle. Finally, it explores the concept of axes of symmetry in regular polygons.

هتتعلم إيه فى الدرس ده

• A polygon is a closed shape made of line segments. It can be convex (all angles < 180°) or concave (at least one angle > 180°).
• The sum of the interior angles of an n-sided polygon is (n - 2) × 180°.
• In a regular polygon, all sides and interior angles are equal. The measure of each interior angle is ((n - 2) × 180°) / n.
• A regular polygon with n sides has n axes of symmetry.