Geometry Formulas and Example Questions

Geometric formulas, or "rumus geometrik" in Indonesian, refer to standard mathematical equations for calculating properties like area, perimeter, and volume of 2D and 3D shapes in plane and solid geometry.

Basic 2D Formulas
Common formulas include those for squares, rectangles, triangles, and circles.


Where [ a ] is side length, [ l ] and [ b ] are length and breadth, [ b ] and [ h ] are base and height, and [ r ] is radius.

2D Shape Problems
Solve these basic plane geometry problems using standard formulas.

Example 1: A square has a side length of 8 cm. Calculate its area and perimeter.
Solution: Area = side² = 8² = 64 cm². Perimeter = 4 × side = 32 cm.

Example 2: A rectangle measures 12 cm long and 5 cm wide. Find its perimeter.
Solution: Perimeter = 2(length + width) = 2(12 + 5) = 34 cm.

Example 3: The base of a triangle is 10 cm and height is 6 cm. What is the area?
Solution: Area = (1/2) × base × height = (1/2) × 10 × 6 = 30 cm².

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