Okay, her brother drawings are 43.5 cm by 934 mm.
First thing we need to do id get alike measurements.
1 cm = 10 mm.
Multiply 43.5 by 10 934 mm = 435
Now since we are framing something we need to find the perimeter.
Write an equation: P= cm of wood= w
w= 2(43.5)+2(435)
Simplify:
w=951
Answer:
951 cm of wood