Answer:

Step-by-step explanation:

Length=x
Width=4x
4x•x=400 sq cm
x= 10 cm
4x= 40 cm
P=2•10cm+2•40 cm
=100 cm
Answer:
Step-by-step explanation:
The ladder is the hypotenuse of the triangle with legs of 3 m and 10 m.
<u>The length of the ladder is:</u>