Area of a Triangle | Notes and Sample Questions
- Walter Education
- Jun 30
- 1 min read
Updated: Jul 28
What is a Triangle ?
A triangle is a simple 2D shape with three straight sides, three angles, and three vertices (corners). It’s one of the most fundamental shapes in geometry!
Key Features of a Triangle:
3 Sides: Three connected straight lines.
3 Angles: Always add up to 180°.
3 Vertices: Points where two sides meet.
Real-Life Examples
Pyramids: Triangular sides (3D version).
Sandwiches: Cut diagonally → two right triangles.
Road Signs: Many use triangular shapes (e.g., yield signs).
Types of Triangles
Triangles can be classified in two ways:
Examples of Area of Triangle Questions !
Q24) Our in-house teaching materials SAP P5 Mock Exam 5 paper 1 Q24
Solution:
Formula of area of triangle = ½ x base x height
Base = 18 cm
Height = 8 cm
Area of triangle = ½ x 18 cm x 8 cm
= 72 cm²
Q14) P5_Maths_WA1_2024_RedSwastika_Exam_Papers
a) What is the area of triangle CDE ?
Solution:
Since ABCD is a square, all four sides must be equal in length.
Base = 10 cm
Height = 10 cm
Area of Triangle CDE = ½ x base x height
= ½ x 10 cm x 10 cm
= 50 cm²
b) What is the area of shaded part X ?
Solution:
Base = 10 cm
Height = 6 cm
Area of Triangle CDF = ½ x base x height
= ½ x 10 cm x 6 cm
= 30 cm²
Therefore, area of shaded part X = Area of Triangle CDE - Area of Triangle CDF
= 50 cm² - 30 cm²
= 20 cm²
