GEOMETRY QUICK GUIDE 4 - 2D SHAPES FORMULAS - Triangle, circle, and quadrilateral formula sheet

Oct 22, 2026

Uploaded by Aditya

Geometry Quick Guide 4: 2D Shapes Formulas provides a compact formula reference for core planar shapes. It includes triangle facts such as angle sum and area, the Pythagoras’ theorem for right triangles, and basic trigonometry relations using angles. It also summarizes circle measurements including parts of a circle, circumference, area, arc length, and sector area. For quadrilaterals it covers angle sums and key area/perimeter formulas for rectangles, parallelograms, and trapeziums.

LanguageEnglish

CategoryExam

FormatPDF

Pages2

Reading Time5 min

AccessFree to download

Triangle formulas

Circle formulas

Quadrilateral formulas

FAQs

What are the main triangle formulas included in the guide?

The guide states that triangle angles sum to 180° and that the area of a triangle is ½ × base × height (½bh). It also includes Pythagoras’ theorem for right triangles: a² + b² = c², plus basic trigonometry laws.

Which circle formulas are provided?

It includes circumference formulas (2πr or πd), the area of a circle (πr²), arc length (L = 2πr(θ/360)), and sector area (πr²(θ/360)), along with “parts of a circle.”

What quadrilateral area and perimeter formulas does the guide list?

It gives the quadrilateral angle sum as 360° and includes rectangle area and perimeter (area = b×h, perimeter = 2b + 2h), parallelogram area (b×h), and trapezium area as ½(b1 + b2)×h.

Oct 22, 2026

Uploaded by Aditya