Answer:
Princess needs to know how tall his 6 years old sister. which these will she use?
b.ruler
Step-by-step explanation:
Lightly mark the wall with a pencil at the point where the ruler or book (or other flat object) meets your head. Use a tape measure — ideally a metal one that will remain straight — to measure the distance from the floor to the mark on the wall.
How?
Place one end of the ruler flat on the floor and position it so it's pressed vertically against the wall. Mark the top end of the ruler with a pencil. Then, move the ruler up so the bottom aligns with that pencil mark and mark the new top edge. Repeat this process until you've reached the mark for your height.
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