Step 1.

Before going out of the house, ask the height of your friend. It is better if the height of your friend is a whole number. For example, 3 ft., 4 ft. or 5ft.

Step 2.

Look for a tall structure outside your house. It can be a tree. If you are in your schoolyard select the flagpole.

Step 3.

Get your friend stand below the tree or the flagpole.

Step 4.

Stand from a distance. Take out your pencil and hold the pencil in front of you with your friend as the background.

Step 5.

Adjust the pencil so that the head of your friend will fall at the tip of the pencil. Once you did this, adjust your thumb down until it rest at the foot of your friend.

From the tip of the pencil down to your thumb is one unit.

Step 6.

Steady your hand and scale the flagpole using the pencil. Count how many times you bring the pencil up until the tip of the flagpole.

Step 7.

Multiply the units by the height of your friend. The result would be the approximate height of the flagpole.