Area and perimeter
Perimeter is the outline (fence, baseboard). Area is the surface (flooring, paint). Rectangle: length × width. Triangle: half of that.
About: Area and perimeter
Perimeter is the outline (fence, baseboard). Area is the surface (flooring, paint). Rectangle: length × width. Triangle: half of that.
Worked examples
How many meters of fence are needed to go around a 27 m by 10 m rectangular lot?
Answer: 74. Perimeter = sum of all sides = 2 × (27 + 10) = 74 m.
A triangle has a base of 11 cm and a height of 18 cm. What is its area in cm²?
Answer: 99. Triangle area = (base × height) ÷ 2 = (11 × 18) ÷ 2 = 99 cm².
A triangle has a base of 15 cm and a height of 15 cm. What is its area in cm²?
Answer: 112.5. Triangle area = (base × height) ÷ 2 = (15 × 15) ÷ 2 = 112.5 cm².