## AREA OF A TRIANGLE

Area of a triangle :

Area of a triangle can be calculated by multiplying base and and height or altitude by 1/2.

Formula :

(1/2) x Base x Height Now let us see example problems to understand this topic.

Example 1 :

Find the area of the triangle having base 8 cm and altitude 4 cm.

Solution :

Area of triangle = (1/2) x Base x Height

Here base = 8 cm and height = 4 cm

=  (1/2) x 8 x 4

=  4 x 4

=  16 cm²

Example 2 :

Find the area of the triangle having base 6 cm and perpendicular height 12 cm.

Solution :

Area of triangle = (1/2) x Base x Height

Here base = 6 cm and height = 12 cm

=  (1/2) x 6 x 12

=  3 x 12

=  36 cm²

Example 3 :

Find the area of the triangle having base 12.5 cm and perpendicular height 10 cm.

Solution :

Area of triangle = (1/2) x Base x Height

Here base = 12.5 cm and height = 10 cm

=  (1/2) x 12.5 x 10

=  12.5 x 5

=  62.5 cm²

Example 4 :

A triangle shaped pillow need to be covered by cloth. The base of the pillow is 15 cm and height is 12 cm. If the cost of 1 square cm cloth is \$3 then what is the total cost of the cloth needed. Solution :

Area of triangle shaped pillow = (1/2) x Base x Height

Here base = 15 cm and height = 12 cm

=  (1/2) x 15 x 12

= 15 x 6

= 90 cm²

The cost of 1 square cm cloth = \$ 3

The total cost = Area of pillow x Cost of 1 square cm cloth

=  90 x 3

= \$270

Hence, the total cost required to cover the pillow is \$ 270.

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