Olibits / Math / Area of Triangle
Primary 5 Math: Area of Triangle Practice
Real Primary 5 Math questions on Area of Triangle, pulled directly from the Olibits question bank — the same questions a child would actually see, not separately written for this page.
MOE strand: Measurement and Geometry
Curriculum alignment
Mathematics Syllabus, Primary One to Six (MOE, 2021 syllabus)
Taught across P1–P6.
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Real Area of Triangle practice questions
What is the formula for the area of a triangle?
2 × base × height
base × height
base + height
1/2 × base × height ✓
The area of a triangle is half the product of its base and its perpendicular height.
In the area formula for a triangle, what does 'height' refer to?
The length of the slanted side
The perpendicular distance from the base to the opposite vertex ✓
The longest side of the triangle
The distance around the triangle
The height must be measured perpendicular (at a right angle) to the chosen base, up to the opposite vertex.
Ali says: 'To find a triangle's area, I can use any two sides of the triangle in the formula 1/2 × side × side.' What is wrong with his statement?
He is completely correct
Triangles don't have a base or height
The formula should be side × side without the 1/2
The formula needs the base and the PERPENDICULAR HEIGHT to that base, not just any two sides - using two sides that aren't perpendicular gives the wrong answer ✓
The area formula 1/2 × base × height requires the height to be perpendicular to the base - using two sides that are not perpendicular to each other does not give the correct area.
Which working correctly finds the area of a triangle with base 14 cm and height 5 cm?
14 ÷ 5 × 2 = 5.6 cm²
14 × 5 = 70 cm²
1/2 × 14 × 5 = 35 cm² ✓
1/2 × (14 + 5) = 9.5 cm²
Area = 1/2 × base × height = 1/2 × 14 × 5 = 35 cm².