What is the area of the shaded region?
21 mm
24 mm
42 mm
48mm

It’s 21.

For the height it’s 6+4+2 = 12
Area of complete triangle is 1/2(b)(h):

(1/2)(12)(5) = 30

Area of small triangle:
(1/2)(4)(3) = 9

30 - 21 = 9

Where is the qeustion

She should use 12/3 to measure