Question

Find the area of the shaded region

Answer 1

107 mm²

Explanation:

The formula of an area of a rectangle:

`A=l\cdot w`

l - length

w - width

The area of ​​a given shaded region is equal to the area of ​​the whole rectangle, minus the area of ​​the small rectangle.

Area of the whole rectangle:

l = 15mm, w = 9mm

A₁ = (15)(9) = 135 mm²

Area of the small rectangle:

l = 7mm, w = 4mm

A₂ = (7)(4) = 28 mm²

Area of the shaded region:

A = A₁ - A₂

A = 135 - 28 = 107 mm²

Answer 2

107mm²

Explanation:

The whole square:

9mm × 15mm = 135mm²

The white area:

7mm × 4mm = 28mm²

Now subtract the white area from the whole square:

135mm² - 28mm² = 107mm²

Shaded Area: 107mm²