Question

wouksheet - 4
The area of a triangle is 90 cm². If its base is 15 cm, find its altitude,​

Answer 1

Answer:

12 cm

Step-by-step explanation:

area = 1/2 × b × h

90 = 1/2 × 15 × h

90 × 2 = 15 × h

180 = 15 × h

h = 180/15 = 12 cm

Answer 2

Answer:

12cm

Step-by-step explanation:

Let the altitude be x

The formula for calculating the area of a triangle

$area = \frac{1}{2} \times altitude \: \times base$

so, now

$90 = \frac{1}{2} \times x \times 15 \\ = > 90 = \frac{15x}{2} \\ = > \frac{90 \times 2}{15} = x \\ = > 12 = x$