Solving Exercise 4 on Pages 88-89 of Math Workbook Grade 5

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Ngày cập nhật gần nhất: 15/4/2026

Solving Exercise 4 on Pages 88-89 of Math Workbook Grade 5 Practice Section: Measuring the Lengths of Rectangular Sides and Calculating Triangle Area

Guidance for Solving Exercise 4 on Pages 88-89 of Math Workbook Grade 5

Solution Method:
Observe the illustrations and determine the height and base of each triangle, then apply the formula for triangle area: A = (base x height) / 2 => In simple words: Triangle area equals the product of the base length and height, divided by 2.

Answer:
a) AB = DC = 4cm, BC = AD = 3cm
The area of triangle ABC is:
AB x BC : 2 = (4 x 3) : 2 = 122 = 6 cm²
b) ME = 1cm, EN = 3cm, MQ = 3cm
The area of triangle MQE is:
3 x 1 : 2 = 1.5 (cm²)
The area of triangle NEP is:
3 x 3 : 2 = 4.5 (cm²)
The total area of triangles AQE and NEP is:
4.5 + 1.5 = 6 (cm²)
The area of triangle EQP is:
3 x 4 - 6 = 6 (cm²)
Or 3 x 4 : 2 = 6 (cm²)

This is the solution for exercise 4 on pages 88-89 of Math Workbook Grade 5. Additionally, this section includes 3 more exercises: Solve Exercise 1 on Pages 88-89 of Math Workbook Grade 5 and Solve Exercise 2 on Pages 88-89 of Math Workbook Grade 5. Solve Exercise 3 on Pages 88-89 of Math Workbook Grade 5, Check out the Math Grade 5 pages 88-89 solution to excel in the subject!

Frequently Asked Questions

What steps should I follow to calculate the area of triangles from the Math Workbook?

To calculate the area of triangles, first observe the illustrations to identify the height and base of each triangle. Then apply the formula: Area = (base x height) / 2.

How do I find the area of triangle ABC in the exercise solution?

The area of triangle ABC is calculated using the lengths AB and BC. With AB = 4cm and BC = 3cm, the area is calculated as: (4 x 3) / 2 = 6 cm².

Can I use the same formula for different triangles in the workbook?

Yes, you can use the formula for triangle area consistently across different triangles. Just ensure to substitute the correct base and height for each specific triangle.

What is the total area of triangles MQE and NEP according to the solution?

The total area of triangles MQE and NEP is calculated by adding their individual areas: MQE is 1.5 cm² and NEP is 4.5 cm², resulting in a total of 6 cm².

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