For those who understand that this is a used item, thank you in advance. Sheets for learning formulas for angles and areas. - Contents: Sum of interior angles of a triangle, knowledge of angles, properties of parallel lines, etc. - Contents: How to measure angles, properties of triangles, relationship between interior and exterior angles. - Contents: Area formulas, calculation of areas of quadrilaterals, circles, and triangles. - Target grades: 4th to 5th grade elementary school. Thank you for looking.