Question

28) Harry has a triangular banner with the dimensions shown below.

What is the area of the banner?

Answer 1

y² +9y

Explanation:

Area of triangle:

base = y +9

height = 2y

`\sf \text{Area of triangle = $(base *height)/(2)$}`

`\sf =((y+9)*2y)/(2)\\\\ = (y + 9) * y`

`\sf = y*y + 9*y\\\\ = y^2 + 9y`