area of triangle

• Math
• Secondary Education
• Age 11

Triangle

Draw the height of the following triangles.

Base

Base

Base

Which letter indicates the triangle's height ?

Look at the triangle's base. Which letter indicates the height?

If N is the base of the triangle, which letter represents the height?

A gardener wants to level a triangular garden with grass. Its base and height are 150m and 50m respectively. If the cost of levelling the garden is Rs.100 per sq. m. Find the cost . (SDG11)

Area of triangle

Activity sheet (Area of Triangle)

Cut along the diagonal to separate the parallelogram into two triangular pieces.

Compare the area of parallelogram and the triangle and complete the activity sheet.

1. What is the formula for Area of Parallelogram?

2. What is the relation between the area of the parallelogram and the area of one triangle?

3. What is the formula for Area of triangle ?

Area of the Traingle=

LO: Develop the formula for finding the area of a triangle.

Area of the Triangle = ½ x base x height

www.geogebra.org

Task1

A triangle has a base length of 14 cm and its perpendicular height is 9cm. Find the area of the triangle.

Task 2

The area of a triangular-shaped garden is 72 sq.m and the height is 24m. Find the base

Task 3

Shown below is a wall. Calculate the area of the wall.

1.The formula for finding the area of triangle=
2.Find the area of the triangle whose base is 12m and height is 8m

TextO: Apply the concept to solve problems.

What can you say about the areas of the following triangles?

LO: Apply the concept to solve problems.

The base and the height of Triangle A are half the base and the height of Triangle B. How many times greater is the area of Triangle B?