Area and perimeter.
Find the solutions to the mathematical problems.

🙂 = Correct, ☹️ = Incorrect

📌 Rules

• Calculate Perimeter (Distance around the outside edge): Add the lengths of all outer sides together.

– Rectangle:Perimeter = 2 × (length + width) or 2l + 2w.

– Compound Shapes: Find all missing side lengths first by comparing parallel opposite sides, then sum all outer edges.

• Calculate Area (Space inside the 2D shape):

– Rectangle / Square:Area = length × width.

– Triangle:Area = (base × perpendicular height) ÷ 2.

– Parallelogram:Area = base × perpendicular height.

– Compound Shapes: Split the shape into smaller rectangles, calculate the area of each, and add them together.

💡 Tips

• Identify correct triangle dimensions: Always use the height that meets the base at a 90° right angle. Ignore slanted side lengths when calculating the area of a triangle!

• Quick typing on our platform: Typing your answer is designed to be super quick and simple! Just type plain digits like 24 or 36 without adding units (e.g. cm, cm², m, m²) or extra spaces.

⚠️ Warnings

• Do not confuse perimeter and area formulas: Remember that perimeter is adding all outer boundary lines (linear measurement), whereas area is multiplying dimensions (square measurement).

• Don’t forget to divide by 2 for triangles: Forgetting to halve base × height is the most common mistake when calculating the area of a triangle!